Two mirrors of the same length are arranges as show in the diagram. A ray of light NO strikes the system at O and emerges along PQ. The emergent ray has been deviated through

A. 220^o
B. 200^o
C. 210^o
D. 180^o

Correct Answer:

Option D = 180^o

Explanation

Deviation angle

= θ1+θ2 = 50 + 50 + 40 + 40

= 180^o