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Light with an energy flux of \( 25 \times 10^{4} \mathrm{Wm}^{-2} \) falls on a perfectly reflecting surface at normal incidence. If the surface area is \( 15 \mathrm{~cm}^{2} \), the average force exerted on the surface is
[CBSE PMT 2014]
(a) \( 1.20 \times 10^{-6} \mathrm{~N} \)
(b) \( 3.0 \times 10^{-6} \mathrm{~N} \)
(c) \( 1.25 \times 10^{-6} \mathrm{~N} \)
(d) \( 2.50 \times 10^{-6} \mathrm{~N} \)
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