Question

a ray of light incident on a plane mirror makes an angle of 20° with the mirror. then the angle between the incident ray and the reflected ray is​

Answer 1

Answer:

It is given that an incident ray strikes a plane mirror at an angle of 20 degrees with the mirror. We know that the angle between the normal and the surface of the mirror is 90. So, the angle between the incident ray and the normal will be 70.

Answer 2

The angle between the incident ray and the reflected ray is $140^{0}$.

Explanation:

Light ray makes an angle of $20^{0}$ with the mirror,

∠ABM=$20^{0}$

Angle of incidence=∠i=$90^{0}$-$20^{0}$

∠i=$70^{0}$

∠i=r

∠r=$70^{0}$

Angle between incident ray and reflected ray =∠i+∠r

$=70^{0}+70^{0}$

$=140^{0}$.