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Reflection of Light — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceReflection of Light1 Mark
Question
The angle between an incident ray and the plane mirror is 30°. The total angle between the incident ray and reflected ray will be:
  1. 30°
  2. 60°
  3. 90°
  4. 120°
✓

Answer

  1. 120°

Explanation:

Since, angle of incidence = 90° - angle between plane mirror and incident ray = 90° - 30° = 60° and according to first law of reflection, angle of incidence = angle of reflection = 60°

Total angle between incident ray and reflected ray = 60° + 60° = 120° 

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