Question

A parallel beam of light is incident normally on a plane surface
absorbing 40% of the light and reflecting the rest. If the
incident beam carries 60 watt of power, the force exerted by it on
the surface is
(a) 3.2 × 10⁻⁸ N (b) 3.2 × 10⁻⁷ N
(c) 5.12 × 10⁻⁷ N (d) 5.12 × 10⁻⁸ N

Answer 1

Answer:

(b)

Explanation:

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Answer 2

Answer:

Answer is B is a right answer