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The Human Eye and the Colourful World Practice Problems with Solutions - CBSE Grade 10

CBSE Grade 10 | Physics | The Human Eye and the Colourful World
Name: _________________________ Date: _________________________ Score: _______ / 40

The iris controls the amount of light entering the eye and the image is formed on the retina, so this Class 10 sheet opens with the two light-handling parts of the eye. The key records accommodation and dispersion among the answers, with scattering explaining the sky.

Key Takeaways

Section A: Multiple Choice Questions (1 Mark Each)

Choose the correct option for each question.
1. The part of the eye that controls the amount of light entering it is the
(a) cornea(b) iris(c) retina(d) pupil
2. The image of an object is formed on which part of the eye?
(a) cornea(b) pupil(c) retina(d) optic nerve
3. The ability of the eye lens to adjust its focal length to see objects at different distances is called
(a) refraction(b) accommodation(c) dispersion(d) scattering
4. A person can see distant objects clearly but cannot see nearby objects clearly. This defect of vision is
(a) myopia(b) hypermetropia(c) presbyopia(d) cataract
5. The splitting of white light into its component colours is called
(a) reflection(b) refraction(c) dispersion(d) scattering
6. The blue colour of the sky is due to
(a) reflection of light(b) refraction of light(c) scattering of light(d) dispersion of light

Section B: Short Answer Type Questions (2 Marks Each)

Show all steps clearly.
7. What is the function of the retina in the human eye?
8. Define accommodation of the eye.
9. What is myopia? How is it corrected?
10. What is hypermetropia? How is it corrected?
11. Why does the sky appear blue?
12. What is dispersion of white light? List the colours of the visible spectrum in order.
13. Why do stars appear to twinkle at night?
14. State the far point and the near point of a normal human eye.

Section C: Numericals & Word Problems (3 Marks Each)

Apply the concepts to solve the problems. Show all working.
15. A myopic person cannot see objects beyond 100 cm. Find the focal length and the power of the lens required to correct the defect. (P = 1 ÷ f, focal length in metres)
16. A hypermetropic person needs a lens of power +2 D. Find the focal length of the lens. (f = 1 ÷ P)
17. The far point of a myopic person is 80 cm. Find the power of the lens required to see distant objects clearly.
18. A person uses a convex lens of focal length 40 cm to read a book. Find the power of the lens. (P = 1 ÷ f)
19. The near point of a hypermetropic eye is 50 cm. Find the power of the lens needed to enable the person to read a book held at 25 cm. (Use the lens formula 1/v - 1/u = 1/f with u = -25 cm and v = -50 cm)
20. A myopic person has a far point of 50 cm. Find the focal length and the power of the lens required to see distant objects clearly.

Answer Key

1. b) iris
2. c) retina
3. b) accommodation
4. b) hypermetropia
5. c) dispersion
6. c) scattering of light
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End of Worksheet

People Also Ask

What controls the amount of light entering the eye?

The iris, option (b) in this worksheet (Q1).

Where is the image formed in the eye?

On the retina, option (c) in this worksheet (Q2).

What does the ciliary muscle adjust?

Accommodation, option (b) in this worksheet (Q3).

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