Question

When the angle between incident ray and mirror is ${20}^o$, calculate the angle of incidence and angle of reflection.

• A. Angle of incidence = ${20}^o$
  Angle of reflection = ${50}^o$
• B. Angle of incidence = ${20}^o$
  Angle of reflection = ${20}^o$
• C. Angle of incidence = ${70}^o$
  Angle of reflection = ${70}^o$
• D. Angle of incidence = ${160}^o$
  Angle of reflection = ${50}^o$

Answer 1

The correct option is C Angle of incidence = ${70}^o$

Angle of reflection = ${70}^o$
Angle between incident ray and mirror$=$ glancing angle of incidence$={20}^0$

$\therefore$ angle of incidence$={90}^0-$ glancing angle of incidence$={90}^0-{20}^0={70}^0$

Angle of reflection$=$ angle of incidence$={70}^0$