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A light of wavelength lambda and intensity l is incident normally on the surface. If reflection coefficient of surface is r, the pressure exerted

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\(F=\frac{dP}{dt}=(\frac{IA}{\frac{hc}{\lambda}})(1+r)\frac{h}{\lambda}\)

\(\implies P=\frac{F}{A}=\frac{I}{c}(1+r)\)

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