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A ray of light is incident on 'a plane mirror at an angle of 20o. This mirror is ...

A ray of light is incident on 'a plane mirror at an angle of 20o. This mirror is rotated through, twice this angle, In this new position the angle between the incident ray and the reflected ray is

A. 20o
B. 40o
C. 80o
D. 120o.




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