Assignment B
1. A man can read the number of a distant bus clearly, but he finds difficulty in reading a book.
From which defect of the eye is suffering from?
2. What type of spectacles should be worn by a person having the defects of myopia as well as
hypermetropia? How does it help?
3. The sun near the horizon appears flattened at the sun set and sun rise. Explain why.
4. Explain why and when the sun is overhead at noon it appears white
5. A boy uses spectacles of focal length -50 cm. Name the defect of vision he is suffering from.
Compute the power of this lens.
6. Give the meaning of the term ‚ VIBGYOR‛ with which phenomenon is itconnected?
7. Explain the following terms connected with the eye. (i) Ciliary muscles (ii) Accommodation.
8. What is meant by spectrum of white light?
9. What will be colour of the sky in the absence of atmosphere?
10. Why are the traffic light signals (or danger signals) of red colour?
11. Why does the sky appear dark and black to an astronaut instead of blue?
12. Explain why, when the sun is overhead at noon, it appears white?
13. What is Atmospheric Refraction?
14. A person with myopic eye cannot see objects beyond 1.2metre distinctly. What should be
the nature of corrective lenses to restore proper vision?
15. 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?
16. The far point of myopic person is 80 cm in front of the eye. What is the nature and power of
the lens required to enable him to see very distant objects distinctly?
17. The far point of myopic person is 150 cm in front the eye. Calculate the focal length and
power of a lens required to enable him to see distant objects clearly.
18. How is the eye lens held in its position?
19. What is meant by near point?
20. What is meant by least distance of distinct vision?
1. A man can read the number of a distant bus clearly, but he finds difficulty in reading a book.
From which defect of the eye is suffering from?
2. What type of spectacles should be worn by a person having the defects of myopia as well as
hypermetropia? How does it help?
3. The sun near the horizon appears flattened at the sun set and sun rise. Explain why.
4. Explain why and when the sun is overhead at noon it appears white
5. A boy uses spectacles of focal length -50 cm. Name the defect of vision he is suffering from.
Compute the power of this lens.
6. Give the meaning of the term ‚ VIBGYOR‛ with which phenomenon is itconnected?
7. Explain the following terms connected with the eye. (i) Ciliary muscles (ii) Accommodation.
8. What is meant by spectrum of white light?
9. What will be colour of the sky in the absence of atmosphere?
10. Why are the traffic light signals (or danger signals) of red colour?
11. Why does the sky appear dark and black to an astronaut instead of blue?
12. Explain why, when the sun is overhead at noon, it appears white?
13. What is Atmospheric Refraction?
14. A person with myopic eye cannot see objects beyond 1.2metre distinctly. What should be
the nature of corrective lenses to restore proper vision?
15. 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?
16. The far point of myopic person is 80 cm in front of the eye. What is the nature and power of
the lens required to enable him to see very distant objects distinctly?
17. The far point of myopic person is 150 cm in front the eye. Calculate the focal length and
power of a lens required to enable him to see distant objects clearly.
18. How is the eye lens held in its position?
19. What is meant by near point?
20. What is meant by least distance of distinct vision?
