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Laws of Reflection

Two plane mir...

Question

Two plane mirror are inclined to one another at an angle of $60^{o}$ . A ray is incident on mirror $M_{1}$ at an angle $i$ . The reflected ray from mirror $M_{2}$ is parallel to mirror $M_{1}$ as shown in figure. The angle of incidence $i$ is:

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Solution

It is given that final ray is parallel to M₁.

So,
$30 + i = 90 - i$

$2 i = 60$

$i = 30^{0}$

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