71. The speed of light is maximum in which of the following mediums?
72. When a beam of white light passes through a glass prism, the colour of light beam that deviates the least is
73. Absolute refractive index of diamond is . . . . . . . .
74. The focal length of the objective lens of a telescope is 50 cm. If the magnification of the telescope is 25, then the focal length of the eyepiece is
75. In the absence of the earth's atmosphere, sky would appear
76. A concave mirror is placed in front of the sun in such a way that the rays of the sun converge at a point 5 m away on the main axis of the mirror. Now if a candle 3 m long is placed at a distance of 10 m on the main axis of the mirror, how far will the image of the candle will be formed?
77. The terminal colour bands of the rainbow are
78. Assertion (A): A stick is dipped in water in a slanting position. If observed sideways, the stick appears short and bent at the surface of the water.
Reason (R): A light coming from the stick undergoes scattering from water molecules giving the stick a short and bent appearance.
Reason (R): A light coming from the stick undergoes scattering from water molecules giving the stick a short and bent appearance.
79. A defect of vision in which the points in one plane of an object appear infocus while those in another plane are out of focus is called
80. The focal length of a convex lens is 25 cm. Calculate its power.
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