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CBSE Class 10 Answered

prove that:A Ray Of Light reflected from a plane mirror rotates through an angle2x when the mirror
Asked by irenegladis | 08 Apr, 2009, 09:25: PM
answered-by-expert Expert Answer

Consider a plane-mirror and a fixed incident ray of light reflecting from the surface at an angle θi. Before the mirror has rotated, the angle of incidence is θ as is the angle of reflection. If the mirror is rotated through an angle φ the normal is rotated by an angle φ and thus the angle of incidence increases to θ +φ. Therefore, the angle of reflection must also increase by φ to θ+φ The difference between the final angle of reflection and the initial angle of reflection and is 2φ

Answered by | 01 May, 2009, 03:23: PM

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