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CBSE Class 10 Physics Worksheet - Human Eye and the Colorful World - Practice worksheets for CBSE students. Prepared by teachers of the best CBSE schools in India.
Class: X Physics
Chapter: Human Eye and the Colorful World
Question. What would have been the colour of sky if the earth had no atmosphere?
Ans. The sky would have looked dark if the earth had no atmosphere as there would not have been any scattering.
Question. On what factor does colour of scattered light depend?
Ans. The colour of scattered light depends on the size of the scattering particle. Very fine particles scatter mainly blue light whereas particles of larger size scatter light of longer wavelengths.
Question. Why is a small amount of sodium thiosulphate added to water in tank in the activity to understand reddish appearance of sun at sunrise and sunset?
Ans. Sodium thiosulphate is added to water in the tank for precipitating minute colloidal sulphur particles which scatter short wavelengths of light.
Question. State one effect produced by the scattering of light by the atmosphere.
Ans. There are two effects produced due to scattering of light in the atmosphere: tyndall effect and appearance of the blue colour of the sky. Related Theory When light moves from one medium to another, the light scatters in different directions due to change in the medium. This is called scattering of light. When tiny particles of dust come in front of light and leads to its scattering, this is called tyndall effect. We can see these tiny dust particles in the scattered light.
When the light from stars enters the atmosphere, the light with smaller wavelengths gets easily scattered, while lights with longer wavelength do not scatter much and hence travels straight. This gives red colour to the sky during sunrise and sunset. On the other hand, the shorter wavelengths scatter in the sky and give the sky its usual blue colour.
1. What is meant by power of accommodation of the eye?
2. Define the following terms- a)Persistence of vision b) Far point of the eye c)Near point of the eye d)Least distance of distinct vision
3. What is the condition of the ciliary muscles of the eye when the eye is looking at a distant object. What is its effect on the focal length of the eye lens?
4. Why are we not able to see things clearly for some time when we enter fro bright light to a darkened cinema hall?
5. A student has difficulty in reading the blackboard while sitting on the last desk. From what defect of vision is he suffering? How can it be corrected? Draw ray diagram for it.
6. What happens to the image distance in the eye when we increase the distance of an object from the eye?
7. What do you mean by dispersion?
8. Why do different colours deviate through different angles on passing through a prism?
9. How do we see colours?
10. Why does the sky appear dark instead of blue to an astronaut?
11. Why does the sun appear reddish early in the morning?
12. Explain the formation of a rainbow.
13. What is the cause of twinkling of stars?
14. Why are danger signal lights red in colour?
15. What information do we get about sunlight from the formation of a rainbow?
16. Why does the sun appear red at sunrise and sunset?
17. What are ‘bifocal’ lenses?Under what condition(s) are these required by a person?
18. A person with a myopic eye cannot see objects beyond 1.2m distinctly. What should be the nature of corrective lens to restore proper vision? (P= -0.83 Lens – concave)
19. The near point of a hypermetropic eye is at 75 cm from the eye. What is the power of the lens required to enable him to read clearly a book held at 25 cm from the eye? (P= 2.66D)
20. A myopic person uses specs of power – 0.5D. What is the distance of far point of his eye? (2m)
21. A person wants to read a book placed at 20 cm, whereas near point of his eye is 30 cm. calculate the power of the lens required (1.67D).
22. The far point distance of a short sighted person is 1.5meters. find the focal length, power and nature of the remedial lens? (-1.5 m, -0.67D, concave lens)
23. A person having a myopic eye uses a concave lens of focal length 10 cm. Find the power of the lens. (-10D)
24. A person with myopic eyes is nit able to see objects beyond 3 m. determine the nature, focal length and power of the correcting lens? (divergent, -3m,-3.3D)
25. A person can see clearly up to 3m. Name the defect of vision he is suffering from. What type of lens should be used so that he can clearly see up to 12m.find its power. (-0.25D)
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