A point source of light placed in a homogeneous medium gives rise to ___________________?
Correct answer: C. a spherical wave front
- A. a cylindrical wave front
- B. an elliptical wave front
- C. a spherical wave front
- D. a plane wave front
Explanation
Wavefronts from a point source spread equally in all directions in a homogeneous medium, forming concentric spheres centred on the source. Option d is tempting when the source is considered very far away, because a small part of a spherical wavefront then appears plane.
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