71. When light passes from one medium to another, this phenomenon of change in its direction is called . . . . . . . .
72. Which of the following is not a example of refraction of light?
73. If an object is placed at the center of curvature of a concave mirror, its image will be such that-
74. An object is placed in front of a convex mirror. Which one of the following statement is correct?
75. When an object is placed at infinity in front of a concave mirror, its image is at-
76. The objects that themselves do not produce light is called-
77. The ratio of the height of image to the height of the object is called-
78. The region where all of the light from the source is blocked is called:
79. The shape of the image produced by a converging mirror when an object is placed at the main focus, it happens . . . . . . . . .
80. Myopia is the same as
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