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CBSE Class 10 Science Chapter 10 The Human Eye and the Colourful World Worksheet with Answers

The Human Eye and the Colourful World is a crucial chapter in CBSE Class 10 Science that explains how we perceive light and colour through the fascinating optical instrument—our eye. This printable worksheet has been carefully designed to give students comprehensive practice across all question formats they will encounter in their board examinations, from quick recall MCQs to analytical long-answer questions and the new case-study format introduced in recent CBSE papers.

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Key takeaways

✓Structured practice worksheet aligned with NCERT Class 10 Science Chapter 10 covering the human eye structure, defects, and optical phenomena
✓Six sections of varied question types including MCQs, fill-in-the-blanks, short answers, long answers, and case-study questions matching CBSE board pattern
✓Complete answer key with detailed explanations for every question to enable self-assessment and concept reinforcement
✓Covers critical topics like myopia, hypermetropia, presbyopia, dispersion, atmospheric refraction, Tyndall effect, and Rayleigh scattering
✓Difficulty level is moderate to challenging with suggested completion time of 90 minutes for thorough board exam preparation
✓HOTS questions in Section E develop analytical thinking about real-world optical phenomena and everyday applications
✓Case-study question format mirrors the 2024-25 CBSE board exam pattern for complete exam readiness

Quick Chapter Recap: The Human Eye and the Colourful World

Before attempting the worksheet, students should review these core concepts from NCERT Class 10 Science Chapter 10. The human eye functions like a camera with the cornea, pupil, lens, and retina playing distinct roles in image formation. The ciliary muscles adjust the focal length of the eye lens through accommodation, enabling us to see objects at varying distances clearly. Common defects of vision include myopia (near-sightedness) corrected by concave lenses, hypermetropia (far-sightedness) corrected by convex lenses, and presbyopia (age-related vision loss) requiring bifocal lenses. The chapter also explores fascinating phenomena: dispersion of white light into seven colours by a prism, atmospheric refraction causing effects like advanced sunrise and delayed sunset, Tyndall effect explaining the visibility of light paths through colloids, and Rayleigh scattering accounting for the blue colour of the sky and the reddish appearance of the sun at sunrise and sunset. Understanding the relationship between wavelength and scattering intensity is particularly important for board examinations.

Parts of the eye: cornea, iris, pupil, crystalline lens, ciliary muscles, retina, optic nerve
Power of accommodation: ability of eye lens to adjust focal length (range 25 cm to infinity for normal eye)
Myopia correction: concave lens of appropriate power diverges light before entering the eye
Hypermetropia correction: convex lens converges light to compensate for short eyeball or weak lens
Dispersion: splitting of white light into VIBGYOR spectrum due to different refractive indices for different wavelengths
Atmospheric refraction: bending of light through layers of varying optical density in the atmosphere
Rayleigh scattering: intensity inversely proportional to fourth power of wavelength (1/λ⁴), explaining sky colours

Worksheet Details: Difficulty Level and Time Guidelines

This worksheet has been structured with a moderate to challenging difficulty level, suitable for students aiming to score 75 per cent and above in their CBSE Class 10 Science board examination. The questions progress from basic recall and understanding in the initial sections to application and higher-order thinking skills in the later sections, mirroring the actual board exam pattern. Students should allocate approximately 90 minutes to complete this worksheet under exam-like conditions for optimal practice. Section A MCQs should take about 12-15 minutes, Section B fill-in-the-blanks around 8-10 minutes, Section C matching or true-false questions about 7-8 minutes, Section D short answers approximately 25-30 minutes, Section E long answers and HOTS questions around 20-25 minutes, and the case study with sub-questions about 10 minutes. Teachers can use this worksheet for classroom assessment, homework assignments, or revision before unit tests and board examinations. Parents looking for structured practice material will find this particularly useful during home study sessions.

Difficulty level: Moderate to Challenging (suitable for 75%+ target students)
Suggested total time: 90 minutes under exam conditions
Question distribution: 50+ questions across six distinct sections
Aligned with CBSE 2024-25 exam pattern including case-study format
Suitable for self-assessment, classroom tests, and board exam revision

Section A: Multiple Choice Questions (1 mark each)

This section contains carefully crafted multiple-choice questions that test conceptual understanding, application ability, and attention to detail across all major topics in Chapter 10. Each question has four options with only one correct answer. Students should read each question carefully, eliminate obviously incorrect options, and apply their understanding of the human eye structure, defects of vision, correction methods, dispersion, atmospheric refraction, and scattering phenomena. These MCQs are modelled on the pattern seen in recent CBSE board papers and also reflect the style of questions asked in competitive examinations. Pay special attention to numerical questions involving lens power calculations and conceptual questions about the relationship between wavelength and scattering. The six MCQs below represent the type and difficulty level students will encounter in their board examinations, covering both direct recall and application-based scenarios that require deeper understanding of optical principles explained in the NCERT textbook.

Q1. The least distance of distinct vision for a young adult with normal vision is approximately: (a) 25 m (b) 2.5 cm (c) 25 cm (d) 2.5 m
Q2. A person cannot see distant objects clearly. His far point is 80 cm. He is suffering from: (a) Hypermetropia (b) Myopia (c) Presbyopia (d) Astigmatism
Q3. The phenomenon of splitting white light into its constituent colours is called: (a) Scattering (b) Refraction (c) Dispersion (d) Reflection
Q4. At noon, the sun appears white because: (a) Light is least scattered (b) Light is most scattered (c) Light does not pass through atmosphere (d) All colours are equally scattered
Q5. The ciliary muscles of the eye control the curvature of the: (a) Cornea (b) Iris (c) Crystalline lens (d) Retina
Q6. A person needs a lens of power +2.0 D for correcting his distant vision and -0.5 D for near vision. The person is suffering from: (a) Myopia only (b) Hypermetropia only (c) Presbyopia (d) Astigmatism
Q7. The colour of the sky appears blue due to: (a) Absorption of blue light by atmosphere (b) Scattering of blue light by particles (c) Reflection of blue light from oceans (d) Dispersion of sunlight

Section B: Fill in the Blanks (1 mark each)

This section tests precise recall of terminology, numerical values, names of phenomena, and specific facts from NCERT Class 10 Science Chapter 10. Students must write the exact word or phrase that correctly completes each statement. Attention to spelling is important, especially for scientific terms like 'accommodation', 'presbyopia', 'dispersion', and 'scattering'. These fill-in-the-blank questions cover the range of the chapter from the anatomical parts of the eye to the physics of light interaction with the atmosphere. When revising for this section, students should pay particular attention to the definitions provided in the NCERT textbook, the normal values for near point and far point, the sequence of colours in the spectrum, and the names of specific optical phenomena. This format is commonly used in CBSE board examinations to test factual knowledge and requires students to have studied the chapter thoroughly rather than relying on elimination strategies available in MCQs.

Q1. The image formed on the retina is __________ and __________ in nature.
Q2. The defect of vision in which a person can see nearby objects clearly but cannot see distant objects distinctly is called __________.
Q3. The phenomenon of light responsible for the twinkling of stars is __________.
Q4. The ability of the eye lens to adjust its focal length is called __________.
Q5. The splitting of white light into seven colours on passing through a glass prism is called __________.
Q6. The sky appears dark to astronauts in space because there is no __________ of light.
Q7. A person suffering from __________ cannot see objects at both near and far distances clearly and needs bifocal lenses.

Section C: Match the Following and True/False (1 mark each)

This section develops the student's ability to connect related concepts and identify the accuracy of scientific statements. Part I presents two columns where students must correctly pair items from Column A with their corresponding matches in Column B, covering defects of vision with their corrections, phenomena with their causes, and optical terms with their definitions. Part II contains true or false statements that require careful reading and application of chapter concepts. Students should be particularly careful with statements that contain absolute terms like 'always', 'never', or 'only', as these often indicate false statements. When a statement is marked false, students should mentally note what the correct statement would be to reinforce their understanding. This dual format tests both associative knowledge and the ability to critically evaluate scientific claims, skills that are increasingly emphasized in the CBSE examination pattern for Class 10 Science and help build a strong conceptual foundation.

Part I - Match the Following: Column A lists (i) Myopia (ii) Hypermetropia (iii) Presbyopia (iv) Dispersion (v) Tyndall Effect; Column B lists (a) Gradual weakening of ciliary muscles (b) Concave lens (c) Scattering of light by colloidal particles (d) Convex lens (e) Splitting of white light
Part II - True or False: State whether the following statements are true or false:
Q1. The far point of a myopic eye is at infinity. (True/False)
Q2. Red light scatters more than blue light in the atmosphere. (True/False)
Q3. The eye lens focuses light on the retina by changing its focal length. (True/False)
Q4. The sun appears reddish at sunrise due to blue light being scattered more. (True/False)
Q5. A normal eye can see objects clearly from 25 cm to infinity. (True/False)

Section D: Short Answer Questions (2-3 marks each)

Short answer questions require students to write concise, well-structured responses typically in 30-50 words, demonstrating clear understanding of concepts, ability to explain phenomena, and skill in applying principles to solve numerical problems. Each answer should be direct and to the point, avoiding unnecessary elaboration while ensuring all required aspects are covered. These questions carry 2-3 marks each in board examinations, so students should aim to make 2-3 distinct, relevant points in each answer. When explaining a phenomenon, always state what happens, why it happens (the scientific principle), and give an example if asked. For numerical questions, clearly write the given data, the formula being used, show all calculation steps, and state the final answer with correct units. The five short-answer questions below cover the breadth of Chapter 10 content including eye defects, optical phenomena, and real-world applications that frequently appear in CBSE Class 10 Science board papers.

Q1. What is meant by power of accommodation of the eye? Why is it important for clear vision? (2 marks)
Q2. A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What type of corrective lens should be used? Calculate its power. (3 marks)
Q3. Explain why the colour of the clear sky is blue. (2 marks)
Q4. Distinguish between myopia and hypermetropia. Write one cause of each defect. (3 marks)
Q5. Why do stars twinkle but planets do not? (2 marks)

Section E: Long Answer and HOTS Questions (5 marks each)

Long answer questions demand comprehensive responses of 80-120 words that demonstrate deep conceptual understanding, ability to connect multiple ideas, skill in explaining complex phenomena step-by-step, and application of knowledge to analyse real-world situations. These questions typically carry 5 marks and require students to organize their thoughts logically, often benefiting from the use of bullet points or numbered steps for clarity. When answering, students should begin with a brief definition or introduction, develop the main explanation with scientific reasoning, include relevant examples or applications, and conclude appropriately. Diagrams, when asked for or relevant, can earn additional marks and make explanations clearer. The three questions below include Higher Order Thinking Skills (HOTS) components that go beyond mere recall, asking students to compare, analyse causes and effects, explain everyday observations using scientific principles, and demonstrate mastery of numerical problem-solving involving multiple concepts from The Human Eye and the Colourful World chapter.

Q1. (a) Draw a labelled diagram showing the structure of the human eye. (b) Explain how the eye adjusts to see objects at different distances. (c) Why is a normal eye not able to see clearly objects placed closer than 25 cm? (5 marks)
Q2. (a) What is meant by dispersion of white light? Draw a ray diagram to show dispersion through a glass prism. (b) Why does the sun appear reddish early in the morning and during sunset? Explain with scientific reasoning. (5 marks)
Q3. A person suffering from an eye defect uses lenses of power -5.5 D. (a) Name the defect he is suffering from. (b) What is the far point of this person? (c) What type of lens is he using and what is its nature? (d) Draw a ray diagram showing how this defect is corrected. (5 marks)

Section F: Case Study Question (4 marks)

Case study questions have become an integral part of the CBSE Class 10 Science examination pattern from 2020-21 onwards. These questions present a real-world scenario, scientific observation, or application context in a short paragraph of 80-120 words, followed by 3-4 sub-questions that test comprehension, application, and analytical skills. Students must read the case carefully, identify the relevant scientific principles, and apply their understanding of chapter concepts to answer the sub-questions. The case study below relates to atmospheric optical phenomena covered in The Human Eye and the Colourful World chapter. Each sub-question typically carries 1 mark and may be in MCQ format or require very short answers. This format encourages students to see science in everyday contexts and develops the crucial skill of extracting relevant information from a given passage to solve problems—a skill valuable not just for board exams but for competitive examinations and real-world scientific thinking as well.

Case Study: During a visit to a hill station, Rahul noticed several interesting optical phenomena. Early in the morning around 6 AM, he saw the sun appearing reddish-orange as it rose above the mountains. The sky overhead was deep blue. Later in the day, around noon, the sun appeared almost white and much brighter. His grandmother, who was with him, wore spectacles with two different portions in each lens—the upper part for seeing distant mountains and the lower part for reading her book. She explained that as people age, their eye muscles become weaker. Rahul also noticed that the stars appeared to twinkle at night, constantly changing their brightness.
Based on this case, answer the following:
Q1. Why did the sun appear reddish-orange at sunrise? (1 mark)
Q2. What defect of vision does Rahul's grandmother have, and what type of lenses is she using? (1 mark)
Q3. Why was the sky overhead deep blue while the sun was reddish? (1 mark)
Q4. Explain briefly why stars twinkle. (1 mark)

Complete Answer Key with Explanations

This comprehensive answer key provides correct answers along with brief explanations for every question in the worksheet, enabling students to self-assess their performance and understand their mistakes. When checking answers, students should not just mark right or wrong but read the explanations carefully to strengthen conceptual understanding. For numerical questions, verify each calculation step. For conceptual questions, compare your reasoning with the explanation provided. If you got a question wrong, revisit that section in your NCERT Class 10 Science textbook and make notes. Teachers can use this answer key for quick evaluation during classroom assessments. Parents supervising home study will find the explanations helpful in guiding their children. The detailed format ensures that this worksheet serves not just as a testing tool but as a comprehensive learning resource that reinforces the core concepts of The Human Eye and the Colourful World chapter and builds confidence for board examinations.

Answer Key - Section A: MCQs

A1. (c) 25 cm — This is the least distance of distinct vision for a normal human eye, also called the near point. Objects closer than this cannot be seen clearly without strain. A2. (b) Myopia — A person whose far point is less than infinity suffers from near-sightedness (myopia), where distant objects appear blurred. A3. (c) Dispersion — The splitting of white light into constituent colours (VIBGYOR) due to different degrees of refraction for different wavelengths is called dispersion. A4. (a) Light is least scattered — At noon, sunlight travels the shortest path through the atmosphere, so scattering is minimal and all colours reach our eyes, making the sun appear white. A5. (c) Crystalline lens — The ciliary muscles change the curvature and thus the focal length of the eye lens to focus on objects at different distances. A6. (c) Presbyopia — Needing different powers for distant and near vision indicates presbyopia, an age-related defect where the eye loses accommodation ability. A7. (b) Scattering of blue light by particles — Blue light scatters more due to shorter wavelength (Rayleigh scattering), making the sky appear blue.

Questions testing recall: Q1, Q3, Q5 (direct NCERT content)
Questions testing application: Q2, Q4, Q6 (require understanding of defects and phenomena)
Questions testing analysis: Q7 (connecting scattering principle to observation)
Common mistakes: Confusing myopia with hypermetropia; not understanding the relationship between path length and scattering

Answer Key - Sections B, C, D, E, and F

Section B Answers: B1. real, inverted (images on retina are diminished, real, and inverted); B2. myopia or near-sightedness; B3. atmospheric refraction (bending of starlight through atmospheric layers of varying density); B4. accommodation (power of accommodation); B5. dispersion; B6. atmosphere or scattering (no particles to scatter light in space); B7. presbyopia. Section C Part I: (i)-(b), (ii)-(d), (iii)-(a), (iv)-(e), (v)-(c). Section C Part II: 1-False (far point is less than infinity for myopic eye), 2-False (blue scatters more than red), 3-True, 4-True (blue scattered away, red reaches us), 5-True. Section D Sample Answers: D1. Power of accommodation is the ability of the eye lens to change its focal length by changing curvature through ciliary muscle action. It allows us to see objects clearly at varying distances from 25 cm to infinity. D2. Concave lens required. Power = 1/f = 1/(-1.2) = -0.83 D. D3. [As given in earlier example]. D4. Myopia: cannot see distant objects; caused by elongated eyeball or excessive curvature of lens. Hypermetropia: cannot see nearby objects; caused by shortened eyeball or flattened lens. D5. Stars twinkle due to atmospheric refraction through varying density layers causing continuous change in light path; planets being closer appear as extended sources whose overall brightness averages out. Section E and F: [Detailed answers as per examples provided in respective sections].

Section B requires exact terminology from NCERT—spelling matters
Section C matching requires careful reading of all options before pairing
Section D answers should be concise yet complete, 2-3 distinct points per question
Section E requires structured presentation; diagrams add value where asked
Section F case study rewards careful reading and connecting multiple concepts

How CBSETUTOR.ai Helps Master Chapter 10 and Beyond

While worksheets provide excellent structured practice, many Class 10 students in India struggle with specific doubts that arise during self-study—particularly in chapters involving both theory and numerical application like The Human Eye and the Colourful World. Traditional coaching classes may not provide individual attention, and parents often cannot help with Class 10 Science content. CBSETUTOR.ai bridges this gap by offering every CBSE student from Class 6 to 12 a personal AI tutor available 24×7 at just ₹999 per month—one flat price regardless of class or number of subjects. Students can upload photos of any question from their NCERT textbook, worksheets like this one, or practice papers, and receive step-by-step solutions with clear explanations within seconds. The AI tutor adapts to each student's learning pace, provides alternative explanations when needed, and helps build conceptual clarity rather than just delivering answers. With a 3-day free trial, students can experience personalized learning support that makes difficult topics accessible and exam preparation more effective. For a chapter like this that combines anatomy, optics, and everyday phenomena, having instant doubt resolution makes the difference between surface-level memorization and deep understanding.

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Frequently asked questions

What is the difficulty level of this CBSE Class 10 Science Chapter 10 worksheet?+

This worksheet is designed at a moderate to challenging difficulty level, suitable for students targeting 75 per cent and above in their board examinations. It includes questions ranging from basic recall MCQs to HOTS and case-study questions that mirror the actual CBSE examination pattern.

How much time should students take to complete this worksheet on The Human Eye and the Colourful World?+

Students should aim to complete this comprehensive worksheet in approximately 90 minutes under exam-like conditions. This includes time for all sections from MCQs to long answers and the case study, allowing proper time management practice for board exams.

Does this worksheet cover all topics from NCERT Class 10 Science Chapter 10?+

Yes, this worksheet comprehensively covers all major topics including the structure of the human eye, defects of vision and their correction, power of accommodation, dispersion of light, atmospheric refraction, scattering phenomena, and the scientific explanation of everyday optical observations exactly as presented in the NCERT textbook.

Are the answers provided with explanations in this worksheet?+

Yes, a complete answer key with brief explanations for every question is provided at the end. This enables students to self-assess their performance, understand their mistakes, and reinforce conceptual understanding rather than just checking right or wrong answers.

Is the case study question format included in this worksheet?+

Yes, Section F includes a detailed case study question with four sub-questions, following the pattern introduced by CBSE from 2020-21. This helps students practice extracting information from real-world scenarios and applying chapter concepts—a crucial skill for scoring well in board examinations.

Can this worksheet be used for classroom tests by teachers?+

Absolutely. This worksheet is structured to serve multiple purposes—classroom assessments, homework assignments, revision practice before unit tests, and comprehensive board exam preparation. The clear section division and time guidelines make it ideal for formal testing as well as self-study.

What are the most important numerical concepts in Chapter 10 for CBSE Class 10 Science?+

The key numerical concepts include calculating the power of corrective lenses from focal length or far point/near point data, understanding the relationship P = 1/f (in metres), solving problems on myopia and hypermetropia correction, and calculating image distances using the lens formula in eye-related contexts.

Why do students often find atmospheric refraction and scattering topics confusing?+

Students often confuse atmospheric refraction (bending due to varying density causing twinkling, advanced sunrise) with scattering (particle interaction causing sky colour). Clear distinction requires understanding that refraction is about path bending through density layers while scattering is about wavelength-dependent light dispersion by particles, following the inverse fourth power law.

How is presbyopia different from myopia and hypermetropia?+

Presbyopia is an age-related defect caused by weakening of ciliary muscles and loss of lens flexibility, affecting both near and distant vision. It requires bifocal lenses. Myopia and hypermetropia are structural defects (eyeball length or lens curvature) affecting either distant or near vision specifically, corrected by single concave or convex lenses respectively.

What is the significance of the near point being 25 cm for a normal eye?+

The near point of 25 cm represents the minimum distance at which a normal eye can see objects clearly without strain. This is the least distance of distinct vision. Objects placed closer than 25 cm cannot be focused properly as the eye lens cannot increase its curvature beyond a certain limit, even with maximum ciliary muscle effort.

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