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Concepts Of Physics MCQ Edition [Volume 1]PhysicsLight Waves

The wavefronts of light arriving from a distant source of unknown shape are approximately

Options

  1. Aplane
  2. Bcylindrical
  3. Celliptical
  4. Dspherical

Correct answer

A. plane

Step-by-step solution

When a light wave travels a very large distance from its source, the radius of curvature of the wavefront becomes extremely large. As a result, a small portion of the wavefront incident on an observer or an optical instrument appears to be flat. Thus, the wavefronts of light arriving from a distant source are approximately plane wavefronts, regardless of the initial shape of the source.

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