Question

For an incident light ray on a mirror, If the angle between the mirror and the incident ray is ${30}^{\circ }$, what will be the angle of reflection?

• A. ${30}^{\circ }$
• B. ${60}^{\circ }$
• C. ${90}^{\circ }$
• D. ${150}^{\circ }$

Answer 1

The correct option is B ${60}^{\circ }$

Angle between mirror and incident ray=${30}^o$

Hence, angle of incidence, $i={90}^o-{30}^o={60}^o$=angle between incident ray and normal

And , angle of reflection=angle of incidence

$⟹$angle of reflection=${60}^o$

Answer-(B).