41. Colour in a colour television is produced by a combination of three basic colours, they are
42. Spherical mirror with reflective surface curved outwards. It is called:
43. If the angle of incidence of a concave mirror is 30°, what will be the value of the angle of reflection?
44. In a magnifying glass . . . . . . . . lens is used.
45. The lens of the eye is behind the
46. Which one of the following combinations of aperture and shutter speed of a camera will allow the maximum exposure?
47. Astronauts see the sky . . . . . . . . from spacecraft.
48. When a CD (Compact disc used in audio and video systems) is seen in Sunlight, rainbow-like colours is seen. This can be explained on the basis of the phenomenon of
49. A star appears twinkling in the sky because of
50. Which can divide the sun's light into its constituent colors?
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