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A point source (S) of light having power...

A point source (S) of light having power 500 W is kept at the focus of a lens of aperture diameter d. The focal length of the lens is `2d/3` . Assume that `40%` of the incident light energy is transmitted through the lens and the complete transmitted light is incident normally on a perfectly reflecting surface placed behind the lens. Calculate the force on the reflecting surface.

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The correct Answer is:
`1.33 xx 10^(-7) N`
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