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A ray of light, passing through the centre of curvature, is incident on a concave mirror. It is reflected by an angle of _______.
Question

A ray of light, passing through the centre of curvature, is incident on a concave mirror. It is reflected by an angle of _______.

A.

20^∘

B.

0^∘

C.

10^∘

D.

30^∘

Correct option is B

Sol: The correct answer is (b) 00^∘

When a ray of light passes through the center of curvatureof a concave mirror, it is incident on the mirror along the normal to the mirror's surface.

Key Points:

  • The center of curvature lies on the principal axis of the concave mirror and is equidistant from every point on the mirror's surface.
  • A ray passing through the center of curvature strikes the mirror perpendicularly (at 90° to the tangent of the mirror's surface at the point of incidence).
  • According to the law of reflection, the angle of incidence (iii) is equal to the angle of reflection (rrr).

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