An object moves at speed v making angle α with the normal toward a stationary plane mirror. At what angle with the normal does the image velocity lie on the other side of the mirror normal?
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An object moves at speed v making angle α with the normal toward a stationary plane mirror. At what angle with the normal does the image velocity lie on the other side of the mirror normal?

G1 Physics · Accepted Answer

The normal component reverses and the tangential component is unchanged, so the image velocity is the mirror reflection of the object velocity and makes the same angle α with the normal.