What should be the angle between two plane mirrorrs so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mi

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What should be the angle between two plane mirrorrs so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrorrs be parallel to each other
A. 60^(@)
B. 90^(@)
C. 120^(@)
D. 45^(@)

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(b) As incident ray and reflected ray are parallel to each other it means, deviation,
delta=180^(@)
becausedelta=360^(@)-2theta
Angle between two plane mirrors
rArr theta=90^(@)