(A) point source emits light waves in all possible directions in a three-dimensional space. Since the speed of light is constant in a homogeneous medi

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(A) point source emits light waves in all possible directions in a three-dimensional space. Since the speed of light is constant in a homogeneous medium, the locus of all points vibrating in the same phase at a given time forms a sphere centered at the source. Therefore, the wavefront originating from a point source is spherical.