A point source of light is 82.0 cm below the surface of a body of water. We have to find the diameter of the largest circle at the surface through which light can emerge from the water.
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Solution: Click For PDF Version Critical angle for water-air interface is given by
The point source of light is 82 cm below the surface of the body of water. Therefore, the diameter of the largest circle at the surface through which light can emerge when the source of light is kept 82 cm below the surface, as shown in the figure, will be
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