Question

it said that nothing is perfectly plane otherwise that would be frictionless but it is said that mirror is 100 % plane that why it reflect the light parallely then the mirror should be frictionless plz clear my doubt​

Answer 1

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HERE IS YOUR ANSWER

Two plane mirror A and B are oriented perpendicular to each other. A light ray incident at angle θ on mirror A is also reflected by the mirror B. If the reflected ray from mirror B is parallel to the incident ray on A, such that the ray reflected from the first mirror as the same angle of incidence on the second mirror then find the value of θ.

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