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Ray Optics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsRay Optics1 Mark
Question
What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other(a) 60°(b) 90°(c) 120°(d) 175°
       
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Answer

(b) 90°

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