Find the angle of deviation (anticlockwise) suffered by a ray incident on a plane mirror, at an angle of incidence 30°. Correct answer is '120'. Can you explain this answer?

Question

Find the angle of deviation (anticlockwise) suffered by a ray incident on a plane mirror, at an angle of incidence 30&deg;.      Correct answer is '120'. Can you explain this answer?

Answer

Angle of deviation is given by a formula : = π-2i.  where π =180 degrees ,i=angle of incidence

Answer

δ ACW = 180° – 60°
= 120° Anticlockwise
δ CW = 180° + 60°
= 240° Clockwise

Answer

δ ACW = 180° – 60°
= 120° Anticlockwise
δ CW = 180° + 60°
= 240° Clockwise

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