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A plane wavefront is incident normally on a biconcave lens. The shape of the wavefront emerging from the lens is :

Options

  1. Aspherical
  2. Bplane
  3. Ccylindrical
  4. Delliptical

Correct answer

A. spherical

Step-by-step solution

A plane wavefront corresponds to a beam of parallel light rays. When parallel rays pass through a biconcave (diverging) lens, they diverge and appear to originate from a single point (the principal focus) on the incident side of the lens. Since the emerging rays are diverging from a virtual point source, the wavefront perpendicular to these rays is spherical. Answer: spherical

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