A light ray is incident on a mirror and gets reflected by it (Fig. 10.21). The angle made by the incident Class 8

A light ray is incident on a mirror and gets reflected by it (Fig. 10.21).The angle made by the incident Class 8

A light ray is incident on a mirror and gets reflected by it (Fig. 10.21). The angle made by the incident ray with the normal to the mirror is 40°. What is the angle made by the reflected ray with the mirror? Class 8

(i) 40°

(ii) 50°

(iii) 45°

(iv) 60°

Answer:

(ii) 50°

If the incident ray makes a 40° angle with the normal, then:

Angle of incidence (i) = 40°

According to the law of reflection,

Angle of reflection (r)

= Angle of incidence (i) = 40°

Now, Angle between reflected ray and mirror = 90° - Angle of reflection

= 90° - 40°

= 50°