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  4. 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

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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

Ray Optics and Optical Instruments

Solution:

From the law of reflection,
image
Let, angle of incidence $=$ angle of reflection $=\theta$
Given, incident ray is perpendicular to reflected ray (from figure)
$\theta=90^{\circ}$
$\Rightarrow \theta=45^{\circ}$
So, angle of incidence $=45^{\circ}$