A beam of white light is incident normally on a plane surface absorbing `70%` of the light and reflecting the rest. If the incident beam carries `30 W` of power, find the force exerted by it on the surface.

A beam of white light is incident normally on a plane surface absorbin

1.	A beam of white light is incident normally on a plane surface absorbing `70%` of the light and reflecting the rest. If the incident beam carries `30 W` of power, find the force exerted by it on the surface.
Answer» Correct Answer - `(1.3xx30)/(3xx10^(8))=1.3xx10^(-7)` change in momentum `DeltaP=0.7(h)/(lambda)+2xx0.3xx(h)/(lambda)` `=1.3(P)/(c )=1.3xx(30)/(3xx10^(8))=1.3xx10^(-7)N`.

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A beam of white light is incident normally on a plane surface absorbing `70%` of the light and reflecting the rest. If the incident beam carries `30 W` of power, find the force exerted by it on the surface.

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