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 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. Find the power (in 
W) of the source needed to support the weight of the mirror. Take 
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W) of the source needed to support the weight of the mirror. Take Question ID - 154139 | SaraNextGen Top Answer 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 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. Find the power (in W) of the source needed to support the weight of the mirror. Take
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 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. Find the power (in W) of the source needed to support the weight of the mirror. Take
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(1) Let
But only 30% of the photons go towards mirrors Then force exerted on mirror is
and this force should be equal to weight of mirror, so
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photons (each of frequency 
) per second are emitted from source. Then power of source is
