A point source of light produces spherical wave fronts of light that spread out

Question

A point source of light produces spherical wave fronts of light that spread out uniformly in all directions in a vacuum. At a given point on one such wave front,

A. the electric field of the wave is perpendicular to the spherical surface of the wave front and points away from the point source.

B. the electric field of the wave is perpendicular to the spherical surface of the wave front and points toward the point source.

C. the electric field of the wave is tangent to the spherical surface of the wave front.

D. not enough information given to decide

Explanation / Answer

the electric field of the wave is tangent to the spherical surface of the wave front.

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