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A perfectly reflecting solid hemisphere ...

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^(2)l)/(c )`

B

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

C

`(4piR^(2)l)/(c )`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
Effected area `=piR^(2)`
Pressure =`(l)/(c )," where, c is speed of light"`
`therefore" Force"=(piR^(2)l)/(c )`
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