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Light: Mirrors and Lenses — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceLight: Mirrors and Lenses1 Mark
MCQ
A light ray is incident on a mirror and gets reflected by it (Figure). The angle made by the incident ray with the normal to the mirror is 40°. What is the angle made by the reflected ray with the mirror?
Image
  • A
    40°
  • ✓
    50°
  • C
    45°
  • D
    60°
✓

Answer

Correct option: B.
50°
(B) 50°,
(ii) If the incident ray makes a 40° angle with the normal, then:
Angle of incidence (i) = 40°
According to the law of reflection,
Angle of reflection (r) = Angle of incidence (i) = 40°
Now, Angle between reflected ray and mirror = 90° – angle of reflection
= 90° – 40°
= 50°

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