Electromagnetic waves are incident normally on a perfectly reflecting surface having surface area $A$. If $I$ is the intensity of the incident electromagnetic radiation and $c$ is the speed of light in vacuum,the force exerted by the electromagnetic wave on the reflecting surface is
- A$2 I A / c$
- B$I A / c$
- C$I A / 2 c$
- D$I / 2 A c$
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