91. In total internal reflection, the light travels from
92. Fibre optics work on the principle of
93. . . . . . . . . lenses are used by people suffering from myopia-
94. One can distinguish a telescope from a microscope by observing
95. Which one of the following statement is correct?
96. Red' is used as a danger signal because
97. When beams of red, blue and green lights fall on the same spot, the colour of the light becomes
98. The concept of expanding universe is based on
99. When a convex lens produces a real image of an object, the minimum distance between the object and image is equal to
100. . . . . . . . . lenses are used by people suffering from hypermetropia.
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