1.

Two plane mirrors are perpendicular to each other. A ray after suffering reflection from the two mirror will beA. perpendicular to the original rayB. parallel to the first rayC. parallel to the first mirrorD. at `45^(@)` to the original ray

Answer» (b) Here angular deviation is `delta=2pi-2theta`
`=2pi-2xx(pi)/2=pi`
Hene final emergent ray is parallel to incident ray.


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