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A perfectly reflecting solid hemisphere of radius R is placed in the path of a parallel beam of light of large aperture. If the beam carrries an intensity l, find the force exerted by the beam on the hemisphere.

A

`(2piR^2l)/c`

B

`(piR^2l)/c`

C

`(4piR^2l)/c`

D

`(piR^2l)/(2c)`

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