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Find the force exerted by a beam of light half a meter across if it perpendicularly...

Find the force exerted by a beam of light half a meter across if it perpendicularly strikes the middle ten-meter-radius circular sheet of plastic with intermediate reflectivity. Assume the power of the beam is 640 W/m2. Now hypothesize how the result would be affected if the beam strikes the sheet at a 45° angle.
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