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1. Two mirrors are placed along OX ane OY. A light ray starts from
(a, b) and after being reflected from the two mirrors reaches the point
(c, d). Prove that for the total time
of travel to be minimum, angle of
incidence is equal to angle of reflec-
tion at each mirror.
A
d
t
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Transcribed Image Text:1. Two mirrors are placed along OX ane OY. A light ray starts from (a, b) and after being reflected from the two mirrors reaches the point (c, d). Prove that for the total time of travel to be minimum, angle of incidence is equal to angle of reflec- tion at each mirror. A d t
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