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Concepts Of Physics MCQ Edition [Volume 1]PhysicsGeometrical Optics

When studying image formation by spherical mirrors, only paraxial rays are considered because they

Options

  1. Acarry most of the intensity of the incident light
  2. Bproduce nearly a point image from a point source
  3. Cexhibit a minimal dispersion effect
  4. Dare geometrically simple to handle

Correct answer

B. produce nearly a point image from a point source

Step-by-step solution

Paraxial rays are the rays that are close to the principal axis and make small angles with it. For a spherical mirror, rays that are far from the principal axis (marginal rays) do not converge at the same point as paraxial rays after reflection, leading to a blurred image. This phenomenon is known as spherical aberration. By restricting the consideration to paraxial rays, spherical aberration is minimized, and all the reflected rays from a point object converge at a single point. Thus, paraxial rays produce nearly

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