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  3. Physics
  4. A person walks at a velocity v in a straight line forming an angle α with the plane of a mirror. Determine the velocity vr e l at which he approaches his image, assuming that the object and its image are symmetric relative to the plane of the mirror.

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Q. A person walks at a velocity $v$ in a straight line forming an angle $\alpha$ with the plane of a mirror. Determine the velocity $v_{r e l}$ at which he approaches his image, assuming that the object and its image are symmetric relative to the plane of the mirror.

Ray Optics and Optical Instruments

Solution:

Correct answer is (a) $2 v \sin \alpha$