71. Rainbow is formed due to
72. The red colour of the Sun at Sunset and Sunrise is due to
73. What is the reason for the sun to appear long circular at sunrise and sunset?
74. This is not a use of a concave mirror
75. The primary colours used in colour television are
76. A microscope used in pathological laboratories forms
77. What is the velocity of light in vacuum?
78. The focal length of a convex lens is . . . . . . . .
79. When light enters the denser medium through the rare medium, . . . . . . . .
80. The . . . . . . . . oval spot in the human eye is the area of best vision
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