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A parallel beam of light strikes a (i) p...

A parallel beam of light strikes a (i) plane mirror (ii) a convex mirror and (iii) a concave mirror. What is the deviation produeced in each case in terms of the angle of incidence (i) ?

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In eacg case, angle of deviation `= 180^@ - 2 i`. For example, for a ray striking a plane mirror normally, `i= 0, r = 0`, angle of deviation `= 180^@` i.e., the ray retraces its path on reflection.
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