Light with an energy flux of 25×10⁴ Wm⁻² falls on a perfectly reflecting surface

Light with an energy flux of 25×10⁴ Wm⁻² falls on a 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 x10⁻⁶ N
(b) 2.50 x10⁻⁶ N
(c) 1.20 x10⁻⁶ N
(d) 3.0 x10⁻⁶ N

Correct Answer:

2.50 x10⁻⁶ N

Explanation:

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