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KCET2026PhysicsRay Optics

The direction of a ray of light incident on a concave mirror is shown by PQ, while direction in which the ray would travel after reflection is shown by four rays marked as A, B, C and D as shown in the figure. Which of the four rays correctly shows the direction of the reflected ray?

Options

  1. AD
  2. BC
  3. CB
  4. DA

Correct answer

B. C

Step-by-step solution

According to the rules of reflection for spherical mirrors, an incident ray parallel to the principal axis of a concave mirror passes through its principal focus ( F ) after reflection. In the given figure, the incident ray PQ is a paraxial ray parallel to the principal axis. Therefore, the reflected ray must pass through the focus F . Among the given rays, ray C passes through the principal focus F . Thus, ray C correctly shows the direction of the reflected ray. Answer: C

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