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If a parallel beam of light having intensity \( \mathrm{I} \) is incident normally on a perfectly reflecting surface, the force exerted on the surface, equals \( \mathrm{F} \) (Assume that the cross section of beam remains constant). When the
\( \mathrm{P} \) surface is held at an angle \( \theta \), the force is
(A) \( 2 \mathrm{~F} \tan \theta \)
(B) \( F \cos \theta \)
(C) \( \mathrm{F} \cos ^{2} \theta \)
(D) \( 2 \mathrm{~F} \)
W.
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