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A point source of light is placed at the origin in an isotropic medium. The wavefronts associated with the light are:
APlane wavefronts
BCylindrical wavefronts
CSpherical wavefronts
DParabolic wavefronts
Answer & Solution
Correct answer: C. Spherical wavefronts
For a point source emitting uniformly in all directions, all points at a given distance from the source vibrate in phase, so the locus of constant phase is a sphere. A line source gives cylindrical wavefronts and a source at infinity (or after a converging lens) gives plane wavefronts.
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