The Human Eye and the Colourful World | CBSE | Class 10 | Physics | Solution

CBSE | Class 10 | Physics | Solution

Chapter 11

The Human Eye and the Colourful World

Free NCERT Solutions for CBSE Class 10 physics are available here to download in PDF. Detailed and appropriate NCERT solutions will help to enhance your problem solving skills and get the desired results in your board examinations.

Page No 190:

Questions:

1. What is meant by power of accommodation of the eye?
2. A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?
3. What is the far point and near point of the human eye with normal vision?
4. A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?

Solutions:

 Textbook Exercise Questions: 

1. The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to
(a) presbyopia.
(b) accommodation.
(c) near-sightedness.
(d) far-sightedness.

2. The human eye forms the image of an object at its
(a) cornea. (b) iris. (c) pupil. (d) retina.

3. The least distance of distinct vision for a young adult with normal vision is about
(a) 25 m. (b) 2.5 cm. (c) 25 cm. (d) 2.5 m.

4. The change in focal length of an eye lens is caused by the action of the
(a) pupil.  (b) retina.  (c) ciliary muscles.  (d) iris.

5. A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision, and (ii) near vision?

6. The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

Solutions from Que 1 to 6 :

7. Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.

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

Solutions from Que 7 to 8 :

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


10. Why do stars twinkle?

11. Explain why the planets do not twinkle.

Solutions from Que 9 to 11 :

12. Why does the Sun appear reddish early in the morning?


13. Why does the sky appear dark instead of blue to an astronaut?

Solutions from Que 12 to 13:

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