Light with an energy flux of 25 10 4 Wm -2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm 2 , the average force exerted on the surface is :-

1. A. 1.25 10 -6 N
2. B. 2.50 10 -6 N
3. C. 1.20 10 -6 N
4. D. 3.0 10 -6 N

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