NDA 2020 Physics question

Light of uniform intensity impinges perpendicularly on a totally reflecting surface. If the area of the surface is halved, the radiation force on it will become

(A)double
(B)halfCorrect
(C)four times
(D)one fourth

Answer: (B)

Solution

For a perfectly reflecting surface the radiation pressure is , and the force is

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Question ID VK-031671