if Monochromatic rays of some intensity fall on a metal plate placed on a rough horizontal surface at certain angle. Will the plate move if the plate is perfectly reflecting irrespective of the value of intensity??
closed as unclear what you're asking by Bill N, Cosmas Zachos, freecharly, Kyle Kanos, Jon Custer Jan 24 '18 at 14:05
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Let's say the plate is in the x-y plane, and the incident rays are in the x-z plane. If the plate is perfectly reflecting, all the incident light will maintain its x-momentum after reflection. The z-component of the momentum is reversed, so the plate experiences a downward force due to the light. But no force in the x or y directions. The plate will not move.