Light

Light Worksheet-7

1. Define dispersion of light.

2. Name the colours in the order they appear in the spectrum of light.

3. What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

4. What are the two factors responsible for an object to be seen?

5. What is meant by normal?

6. Define the angle of incidence.

Light Worksheet-8

21. Name the disease caused by deficiency of vitamin A.

22. What is meant by visually challenged people?

23. What are non-optical aids?

24. What are tactual aids?

25. What is a periscope?

26. If a ray of light falls normally on a mirror, what is angle of reflection?

27. The ray of light that bounces back from a plane mirror.

Light Worksheet-9

41. What is colour blindness? Give reason for this defect?

42. What is a nictating membrane? In which animal is it found?

43. What kind of eyes do the insects have?

44. What is short sightedness? How is it corrected?

45. What is long sightedness? How is it corrected?

46. What kind of problem develops when the lens becomes thick?