A ray of light gets reflected from the plane mirror. The incident ray and the reflected ray are perpendicular to each other. The angle of incidence is

Question

A ray of light gets reflected from the plane mirror. The incident ray and the reflected ray are perpendicular to each other. The angle of incidence is (A) 60° (B) 30° (C) 45° (D) 0°

Tardigrade Admin · Accepted Answer

From the law of reflection, <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/45212595007ad6127659b0ef8477a25a-.png" /> Let, angle of incidence = angle of reflection =θ Given, incident ray is perpendicular to reflected ray (from figure) θ=90° ⇒ θ=45° So, angle of incidence =45°

Q. A ray of light gets reflected from the plane mirror. The incident ray and the reflected ray are perpendicular to each other. The angle of incidence is

$6 0^{\circ}$

$3 0^{\circ}$

$4 5^{\circ}$

$0^{\circ}$

From the law of reflection,

Let, angle of incidence $=$ angle of reflection $= θ$
Given, incident ray is perpendicular to reflected ray (from figure)
$θ = 9 0^{\circ}$
$\Rightarrow θ = 4 5^{\circ}$
So, angle of incidence $= 4 5^{\circ}$