10th Solved questions For Chapter:The Human Eye and the Colorful World

1. What is the function of iris and pupil in the human eye?

2. Define : (i) Power of Accommodation (ii) Far point (iii) Near Point

3. A student has difficulty in reading the black board while sitting in the last row. What could be the defect the child is suffering from? What are its causes? How it can be corrected?

4. Draw diagram showing dispersion of white light by a glass prism.

5. How is rainbow formed? Explain with diagram.

6. What did Newton demonstrated by his experiment?

7. Why stars appears to twinkle but the planets do not?

8. Why is normal eye not able to see clearly the objects placed closer than 25cm?

9. What happens to the image distance in the eye when we increase the distance of an object from the eye?

10. Why sky appears blue in colour?

11. Why does sun appears reddish early in the morning?

12. Why sky appears dark instead of blue to an astronaut?

13. Why danger signals are red in colour?

14. Why we see sunrise two minutes early and delayed sunset?

15. Why sun appears white at noon?
    
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X CBSE Board (Guess Paper 2014) for Practice

1. A person can see only objects beyond 1m. From his eyes. Name the defect of the eye.
2. Out of light of blue and red colours which one is scattered most?
3. What is the function of crystalline lens in the human eye?
4. Which phenomenon is responsible for increasing the apparent length of the day by 4 minute?
5. What is the far point of a person suffering from Myopia.
6. What name is given to front transparent part of human eye?
7. Where do we see :(1) Concave and (2) Convex lens in bifocal lenses.
8. What is the nature of image formed by our eye?
9. Name the liquid which is present between eye lens and cornea.
10. Where does most of the refraction of light in an eye occurs?
11. Which kind of lens is an eye lens?
12. What is the cause of dispersion of light?
13. Under very dim light, we are able to see the objects but can not distinguish between colours why ?
14. What is the range of vision for normal human eye ?
15. How is the amount of light entering the eye controlled ?
16. What is the colour of danger signal? Why?
17. What is rainbow? How is rainbow formed?
18. State two causes of myopic vision.
19. How an uncorrected myopic eye sees far off objects.
20. What is presbyopia? Name the type of lens which can be used to correct presbyopia.
21. Explain why planet do not twinkle at night?
22. Explain about the colour of the sun at sunrise and sunset.
25. 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.
23. Define the term (1) Near point (2) Far point
24. Why is a normal eye not able to see clearly the object closer than 25 cm.

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