two plane mirrors are inclined at 70 degree. by what angle a ray of light will deviate after reflection from both the mirrors?
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Explanation:
Angle incidence on the 2nd mirror.
=90−[180−70−(90−b)]=70−b
Angle between the reflected ray and the 2nd mirror.
=b+20
As it is parallel to 1st mirror
∴b+20=70
∴b=50
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