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In the formation of primary rainbow, the sunlight rays emerge at minimum deviation from rain-drop after
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Correct option is B
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A light ray from air is incident (as shown in figure) at one end of a glass fiber (refractive index = 1.5) making an incidence angle of 60° on the lateral surface, so that it undergoes a total internal reflection. How much time would it take to traverse the straight fiber of length 1 km
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