Question

If a ray of light emit perpendicular to the plane mirror. What will the angle of incidence and angle of reflection. Give particular reason of angle with ray diagram

Answer 1

When a source of light is falling perpendicularly on a plane mirror, the angle of incidence and the angle of reflection is same because they are in a same line at 0°. They incident in a same line and reflect in the same line. So it is a straight path of light.

When a light is falling perpendicularly on a plane mirror we can say,

$Ang. \: i = Ang. \: r$

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