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Q.

A ray of light makes an angle of 10°  with the horizontal and strikes a plane mirror which is inclined at angle θ  to the horizontal. The angle θ  for which the reflected ray becomes vertical, is

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a

80°

b

40°

c

50°

d

100°

answer is A.

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Detailed Solution

Angle between incident ray and reflected ray =80°

i.e., Angle of incidence = Angle of reflection =40°

angle of reflected ray with mirror =90−40=50°

angle with horizontal=90−50=40°

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