A totally reflecting small plane mirror ...

A totally reflecting small plane mirror placed horizontally faces a parallel beam of light as shown in the figure. The mass of the mirror is 200 g. Assume that there is no absorption in the lens and that `20%` of the light emitted by the source goes through the lens. The power of the source needs to support the weight of the mirror is `P xx 10^(8)` watt, where P is [take `g = 10 ms^(-2)`]

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