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KCET2022PhysicsWave Optics

For light diverging from a finite point source,

Options

  1. Athe intensity decreases in proportion to the distance squared
  2. Bthe wavefront is parabolic
  3. Cthe intensity at the wave front does not depend on the distance
  4. Dthe wave front is cylindrical

Correct answer

A. the intensity decreases in proportion to the distance squared

Step-by-step solution

A light diverging from a finite point source produces spherical wavefront that moves in all directions from the point. The intensity of light dependent on the distance and it follows the inverse square law. Hence, the intensity decreases with an increase in the distance from the source.

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