Q.

A ray is reflected in turn by three plain mirrors mutually at right angles to each other. The angle between the incident and the reflected rays is

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a

90°

b

60°

c

180°

d

None of these

answer is C.

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Detailed Solution

Ray after reflection from three mutually perpendicular mirrors becomes anti-parallel.   δ=δ1+δ2+δ3 =1800-2θ+1800-2900-θ+00 =1800The ray never touch the third plane.
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