Question

A ray of light falls on a plane mirror. If the plane mirror is tilted through an angle of 1°, the reflected ray tilts through $\alpha$ degrees. Find $\alpha$.

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Answer 1

Answer:

Normal is perpendicular drawn to surface of mirror or lens. If light fall perpendicular on plane mirror, angle made by light with normal is zero i.e. angle of incidence is zero. Since angle of incidence is equal to angle of reflection, angle of reflection is also zero.

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