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(A) light diverging from a finite point source produces a spherical wavefront that moves in all directions from the point source.As the wavefront expa

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the intensity decreases in proportion to the distance squared

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(A) light diverging from a finite point source produces a spherical wavefront that moves in all directions from the point source.As the wavefront expands, the energy is distributed over a larger surface area $A = 4\pi r^2$.Since intensity $I$ is defined as power per unit area $(I = P/A)$, the intensity is inversely proportional to the square of the distance from the source $(I \propto 1/r^2)$.Therefore, the intensity decreases in proportion to the distance squared as the light propagates.

For light diverging from a finite point source,

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