51. Endoscope' used by the doctors for examining the inside of patient's stomach, works on the principle of
52. Parabolic mirrors are used in
53. Why does sky appear blue?
54. In driving a car which type of mirror would you like to use for observing traffic at your back?
55. Match the following lists.
List-I
List-II
a. Reflection
1. Twinkling effect of stars
b. Refraction
2. Used for reducing glare
c. Interference
3. Light added to light produces darkness
d. Polarisation
4. Change in path of light without change in medium
| List-I | List-II |
| a. Reflection | 1. Twinkling effect of stars |
| b. Refraction | 2. Used for reducing glare |
| c. Interference | 3. Light added to light produces darkness |
| d. Polarisation | 4. Change in path of light without change in medium |
56. The image formed on Retina is
57. Hypermetropia or long-sightedness can be corrected by using
58. For reproducing sound, a CD (Compact Disc) audio player uses a
59. Which colour deviates the least when light passes through a prism?
60. Tyndall effect is related to the . . . . . . . . of light.
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