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

`50^(@)`

`45^(@)`

`30^(@)`

`55^(@)`

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The correct Answer is:

From the diagram `theta=50^(@)`

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