Question

If the glancing angle of incidence is ${30}^o$, what will be the angle of incidence?

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

Answer 1

The correct option is B ${60}^o$

Glancing angle of incidence is defined as the angle between the incident ray and the reflecting surface.

Hence, angle of incidence + glancing angle of incidence = ${90}^0$

So, angle of incidence $={90}^0-$ glancing angle of incidence $={90}^0-{30}^0={60}^0$