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Two plane mirrors are inclined at 70^@. ...

Two plane mirrors are inclined at `70^@`. A ray incident on one mirror at incidence angle `theta` after reflection falls on the second mirror and is reflected from there parallel to the first mirror, The value of `theta` is

A

`50^(@)`

B

`45^(@)`

C

`30^(@)`

D

`25^(@)`

Text Solution

Verified by Experts

The correct Answer is:
A

`90^(@)-(theta)+70^(@)+70^(@)=180^(@)`
`:. (theta)=50^(@)`.
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