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A beam of light is incident normally on a plane surface observing 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

A beam of light is incident normally on a plane surface observing 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

Grade:12th pass

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