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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. `175^(@)`

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Correct Answer - B
Incident ray and finally ray are prallel to each other means `delta=180^(@)`
From `delta-360^(@)-2thetaimplies180^(@)-2thetaimpliestheta=90^(@)`
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