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Two plane mirrors are inclined at 70o. A ray incident on one mirror at angle, θ after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of θ is

a
45o
b
30o
c
55o
d
50o

detailed solution

Correct option is D

Different angles as shown in the figure.θ+40°=90°∴  θ=90°-40°=50°

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