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A point source of radiation of power P i...

A point source of radiation of power `P` is placed on the axis of completely absorbing disc. The distance between the source and the disc is `2 "times"` the radius of the disc. The force that light exerts on the disc is `(Px)/(40c)`. Then the value of `x`

A

`P/c`

B

`P/(5c)`

C

`P/(10c)`

D

`P/20C`

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