MHT CET 2025 Physics question
A parallel beam of light is incident normally on a pane surface absorbing 50% of the light and reflecting the rest. If the incident beam carries 90 W of power, the force exerted by it on the surface is (C = velocity of light in air = m/s)
Answer: (A)
Solution
Radiation force for power : absorbed part gives momentum transfer , reflected part gives . With 50% absorbed and 50% reflected:
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