AIPMT | 2014Wave OpticsHard

Question

Light with an energy flux of 25 × 104 Wm-2 falls ona perfectly reflecting surface at normal incidence. If the surface area is 15 cm2, the average force exerted on the surface is

Options

A.1.25 × 10-6N
B.2.50 × 10-6N
C.1.20 × 10-6 N
D.3.0 × 10-6 N

Solution

Fav = N
250 × 10-8 N = 2.5 × 10-6 N

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