A light of wavelength \[\lambda \] and intensity l is incident normall – McqOptions

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1.	A light of wavelength \[\lambda \] and intensity l is incident normally on the surface. If reflection coefficient of surface is r, the pressure exerted by light on the surface is equal to
A.	\[\frac{2I}{c}\]
B.	\[\frac{I}{c}r\]
C.	\[\frac{I}{c}\left( I+r \right)\]
D.	\[\frac{I}{c}\left( I-r \right)\]
Answer» D. \[\frac{I}{c}\left( I-r \right)\]

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