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Two plane mirrors are inclined at 70 degree. A ray incident on one mirror at angle q after reflection falls on the second mirror

Two plane mirrors are inclined at 70 degree. A ray incident on one mirror at angle q after reflection falls on the second mirror and is reflected from there parallel to the first mirror ,q is

a)50 degree

b)45 degree

c)30 degree

d)55 degree

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Angle q can be calculated by using the below formula:

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