What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other
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a
60o
b
90o
c
120o
d
175o
answer is B.
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Detailed Solution
Incident ray and finally reflected ray are parallel to each other means δ : 180oFrom δ=3600-2θ⇒1800=3600-2θ⇒θ=900
What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other