31. Which one of the following statement about the refractive index of a material medium with respect to air is correct?
32. What does prism do?
33. When an object is placed at the 2F1 position of a convex lens, what is the size of the image?
34. Optical fibres, though bent in any manner, allows light to pass through. What is the inference that one can draw from it?
35. Which one of the following is the natural phenomenon based on a simple periscope works?
36. The amount of light entering into eye can be controlled and regulated by . . . . . . . .
37. The diameter of the reflecting surface of a spherical mirror is called a/an-
38. The blue colour of water in the sea is due to
39. What is the reason behind the extraordinary shining of the diamond cuts in a proper way?
40. In a concave mirror if object is placed at centre of curvature then image will be . . . . . . . .
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