MCQ
When one light ray is reflected from a plane mirror with $30^{\circ}$ angle of reflection, the angle of deviation of the ray after reflection is $.....^{\circ}$
- A$140$
- ✓$120$
- C$110$
- D$130$
✓
Answer
Correct option: B.
$120$
b
$\delta=180^{\circ}-60^{\circ}=120^{\circ}$
$\delta=180^{\circ}-60^{\circ}=120^{\circ}$
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