A beam of white light incident normally on a plane surface absorbing 70% of the light and reflecting the rest . if the incident beam carries 10W of power , find the force exerted by it on the surface . (1) 4.3× 10-5 N. (2) 4.3 × 10-6N. (3) 4.3 × 10-7N. (4) 4.3×10-8N
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