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What should be the angle between two pla...

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

`90^(@)`

B

`120^(@)`

C

`135^(@)`

D

`175^(@)`

Text Solution

Verified by Experts

The correct Answer is:
A
Mirrors XY and YZ are held at `90^(@)`.

Angle of Incidence at one mirror (XY) = I
Angle of incidence at other mirror (YZ) = (90 - i)
Hence, incident ray and final reflected ray after second mirror, have sum of Interior angles as `180^(@)`. Hence, they are parallel to each other for all angles of l.
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