1.

Two plane mirrors are inclined to each other such that a ray of light incident on the first mirror and parallel to the second is reflected from the second mirror parallel to the first mirror. The angle between the two mirrors is :

Answer»

`30^(@)`
`45^(@)`
`60^(@)`
`75^(@)`

Solution :(c ) Let the ANGLE between the two mirrors be `theta`. RAY PQ is parallel to mirror `M_(1)` and Rs is parallel to `M_(2)`.

So " "`angle M_(1) RS = angle ORO = angle M_(1)OM_(2) = theta`
Similarly ""`angleM_(2)QP = angleOQR = angleM_(2)OM_(1) = theta`
`THEREFORE "In" Delta ORO, 3theta = 180^(@) , theta = 60^(@)`.


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