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
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a
45o
b
30o
c
55o
d
50o
answer is D.
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Detailed Solution
Different angles as shown in the figure.θ+40°=90°∴ θ=90°-40°=50°