1.

A totally reflecting small plane mirror placed horizontally faces a parallel beam of light as shown in figure. The mass of the mirror is 20 g. Assume that there is no absorption in the lens and that 30% of the light emitted by the source goes through the lens. The power of the source needed to support the weight of the mirror (in MW) is (Take g = 10 m/s2)

Answer» A totally reflecting small plane mirror placed horizontally faces a parallel beam of light as shown in figure. The mass of the mirror is 20 g. Assume that there is no absorption in the lens and that 30% of the light emitted by the source goes through the lens. The power of the source needed to support the weight of the mirror (in MW) is (Take g = 10 m/s2)








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