Question

If the glancing angle of incidence is 50${}^o$, then calculate the angle between the incident ray and the reflected ray:

• A. ${50}^o$
• B. ${100}^o$
• C. ${130}^o$
• D. ${80}^o$

Answer 1

The correct option is D ${80}^o$

The glancing angle of incidence $={50}^0$.

So, the angle of incidence $i={90}^0-{50}^0={40}^0$

And, the angle of reflection, $r={40}^0$

Angle between incident and reflected rays $=i+r={40}^0+{40}^0={80}^0$