win the two plane mirrors a light ray after reflection one from each of the mirror becomes parallel to the incident ray direction
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When a light ray reflects after hitting a mirror the light ray is completely diverted into the same medium ( except in some conditions when the mirror is not completely opaque and it is partially reflected ).
Consider a ball and a floor.
When a ball is thrown on floor at certain angle it hits the floor at certain angle. When it hits the floor the impulse force generated due to the hit pushes it in the direction whose angle, when measured with respect to a perpendicular line to the floor, is equal to the angle, measured with respect to the same perpendicular line, at which the ball hit the floor. That is because when you divide the force with which the ball hit the floor the components are directed in the direction of motion of the ball.
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