alleryA wavefront is:
AAn electric field
BJust a ray
CA surface of constant phase
DA beam of light
Answer & Solution
Correct answer: C. A surface of constant phase
**Wavefront:** locus of points of a wave that are in the same phase.
Rays of light are perpendicular to wavefronts.
**Plane wavefront:** parallel rays.
**Spherical:** from point source.
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