MCQ
The angle between an incident ray and the plane mirror is $30^{\circ}$. The total angle between the incident ray and reflected ray will be:
- A$30^{\circ}$
- B$60^{\circ}$
- ✓$90^{\circ}$
- D$120^{\circ}$
✓
Answer
Correct option: C.
$90^{\circ}$
Since, angle of incidence $=90^{\circ}$ angle between plane mirror and incident ray $=90^{\circ}-30^{\circ}=60^{\circ}$ and according to first law of reflection, angle of incidence $=$ angle of reflection $=60^{\circ}$
Total angle between incident ray and reflected ray $=60^{\circ}+60^{\circ}=120^{\circ}$
Total angle between incident ray and reflected ray $=60^{\circ}+60^{\circ}=120^{\circ}$
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