Free of light incident on a plane mirror at an angle of incidence 45 degree the deviation produced in the reflected ray with respect to incident ray is
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devation angle is always equals to
180 - 2i or 180 - 2 r
here,
angle of incidence is equal to 45°
then angle of deviation is equal to =
= 180-2×45
=180-90
=90
the answer is 90
Hope it helps you
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