91. The magnifying power of an astronomical telescope can be decreased by
92. A man cannot see clearly beyond 10 m. The disease he suffers from
93. The speed of light in a medium whose refractive index 1.5 is . . . . . . . .
94. A mirage occurs because of
95. A simple microscope consists of a
96. Which of the following can produce a virtual image larger than the object?
97. The light energy escaping from the sun can be spread by
98. Objects that produce their own light, are called-
99. When an object is placed at the center of curvature of a circular concave mirror, what will be the position of image formed by that concave mirror?
100. What is the colour of the light emitted by the Sun?
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