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A light ray incident on a plane mirror gets reflected from it. Another plane mirror is placed such that the reflected ray from the first mirror is incident on it If the reflected ray from the second mirror travels perpendicular to the indecent ray on the first mirror, determine the angle between two plane mirrors.

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(i) Angle of incidence = angle of reflection Sum of the three angles of a triangle = `180^(@)` Draw the ray diagram and determine the sum of the angle of incidences and angle of reflections
` 45^(@)`

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