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What should be the angle between two plane mirrorrs so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrorrs be parallel to each other

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When two plane mirrors are placed at `90^(@)` to each other, then the incident and reflected rays will always be parallel to each other, whatever may be the angle of incidence. The course of rays is shown in Fig. for `i= 45^(@)`.

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