Question

When the angle of reflection is ${60}^0$, what will be the angle between the incident ray and the mirror?

• A. ${30}^o$
• B. ${60}^o$
• C. ${90}^o$
• D. ${45}^o$

Answer 1

The correct option is A ${30}^o$

Angle of reflection$={60}^0$

So, angle of incidence$=$ angle of reflection $={60}^0$

Glancing angle of incidence$={90}^0-$ angle of incidence$={90}^0-{60}^0={30}^0$

The angle between the incident ray and the mirror$=$ glancing angle of incidence $={30}^0$