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A ray of light makes an angle of 10° with the horizontal above it and strikes a plane mirror which is inclined at an angle O to the horizontal. The angle O for which the reflected ray becomes vertical is (a) 40°. (B)50°. (C)80°. (D) 100°

A ray of light makes an angle of 10° with the horizontal above it and strikes a plane mirror which is inclined at an angle O to the horizontal. The angle O for which the reflected ray becomes vertical is
(a) 40°.         (B)50°.        (C)80°.          (D) 100°
 

Grade:12

3 Answers

Abhishek Kumar
askIITians Faculty 253 Points
6 years ago
Draw a ray-diagram,
Angle between the reflected and incident ray = 80 (Final ray is vertical and incidence is 10 wrt horizontal)
Angle of incidence = angle of reflected ray = 40
Angle of reflected ray with mirror = 90 – 40 = 50
So, angle with horizontal = 90 – 50 = 40
SAKSHI
15 Points
2 years ago
A ray of light makes an angle of 10° with the horizontal above it and strikes a plane mirror which is inclined at an angle O to the horizontal. The angle O for which the reflected ray becomes vertical is
Kushagra Madhukar
askIITians Faculty 629 Points
one year ago
Dear student,
Please find the attached solution to your question.
Angle between the reflected and incident ray = 80 (Final ray is vertical and incidence is 10 wrt horizontal)
Angle of incidence(i) = angle of reflection(r) = 40
Angle of reflected ray made with mirror = 90 – 40 = 50
So, angle with horizontal = 90 – 50 = 400

Hope it helps.
Thanks and regards,
Kushagra

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