The diagram in figure shows an incident ray AO and the reflected ray OB from a plane mirror.The angle AOBis30∘. Draw normal on the plane mirror at point O and find the angle of reflection.
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Solution
ON is normal on the plane mirror at point O.
Angle of incidence ∠i=∠AON
Angle of reflection ∠r=∠BON
According to law of reflection, ∠i=∠r
Given, ∠AOB=30∘ ∠AON+∠BON=30∘ ∠i+∠r=30∘ ∠r+∠r=30∘ 2∠r=30∘ ∠r=30∘2 ∠r=15∘
Therefore, the angle of reflection angle is 15∘