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.