Light with an energy flux of 25 ÌÑ 104 Wm‰ÛÒ2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm2, the average force exerted on the surface is
1.25 × 10–6 N
3.0 × 10–6 N
2.50 × 10–6 N
1.20 × 10–6 N
