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Prove that the reflected ray rotates twice the angle through which the plane mirror is rotated.

+4 votes
asked Aug 18, 2016 in Physics by Rahul Roy (7,955 points)

1 Answer

+3 votes
answered Aug 18, 2016 by sarthaks (25,844 points)
selected Apr 4 by sarthaks
Best answer

We know that a ray of light is reflected by an angle about the normal after reflection. Now, when the mirror itself is rotated by θ, the normal also rotates by θ. So the ray of light is reflected at an angle θ about the Normal. Hence the total angle becomes 2θ

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