Question

If the angle between incident ray and normal is ${30}^o$, choose the correct option:

• A. Angle between incident ray and mirror = ${60}^o$
  angle between reflected ray and mirror = ${60}^o$
  Angle between normal and the mirror = ${90}^o$
• B. Angle between incident ray and mirror = ${30}^o$
  angle between reflected ray and mirror = ${30}^o$
  Angle between normal and the mirror = ${30}^o$
• C. Angle between incident ray and mirror = ${120}^o$
  angle between reflected ray and mirror = ${30}^o$
  Angle between normal and the mirror = ${30}^o$
• D. Angle between incident ray and mirror = ${60}^o$
  angle between reflected ray and mirror = ${30}^o$
  Angle between normal and the mirror = ${120}^o$

Answer 1

Answer: (A)

Angle between incident ray and mirror = ${60}^o$

angle between reflected ray and mirror = ${60}^o$
Angle between normal and the mirror = ${90}^o$
Angle between incident ray and normal = ${30}^o$$=$ angle of incidence
So,angle between incident ray and mirror $={90}^0-{30}^0={60}^0$$=$ glancing angle of incidence
Angle between normal and the mirror is ${90}^o$ always.
Angle of reflection $=$ angle of incidence$=$ ${30}^o$

So, glancing angle of reflection$={90}^0-{30}^0={60}^0=$ the angle between reflected ray and the mirror