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Reflection of Light — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10ScienceReflection of Light1 Mark
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
    $60^\circ$
     
  • C
    $90^\circ$
     
  • ✓
    $120^\circ$
✓

Answer

Correct option: D.
$120^\circ$
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 $=60^{\circ}+60^{\circ}=120^{\circ}$

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