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Light emerges out uniformly from a point source placed at the focus of a concave mirror to give out a spherical wave front. As a result of reflection of the paraxial rays from the concave mirror, according to Huygen's theory the reflected light is in the form of a

Options

  1. Aspherical wave front with centre at the focus, and radius equal to the radius of curvature of the mirror
  2. Bspherical wave front with centre at the focus, and radius equal to the focal length of the mirror
  3. Ccylindrical wave front with its axis coinciding with the principal axis of the mirror.
  4. Dplane wave front perpendicular to the reflected beam

Correct answer

D. plane wave front perpendicular to the reflected beam

Step-by-step solution

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