Question

if the incident ray fall with 30 degree on plane mirror and we rotate the mirror by 20 degrees what is the angle of reflection
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Answer 1

Answer:

this is due to the incidence and reflected both angles turning through theta. as the normal to the mirror also rotates. you are rotating the mirror through an angle 30 degrees, so the reflected ray will rotate in the above manner by an angle 60 degrees. 60 -10 = 50 degrees.

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