Compare the change in light intensity with distance from a point source to the c

Question

Compare the change in light intensity with distance from a point source to the change for a source of plane waves (parallel rays). In which case is the change faster?

a)The change is faster for the point source.

b)The light intensities of both sources change equally with distance.

c)The intensity change in plane waves is faster than the point source because the latter is smaller in size.

d)The change is faster for the point source because the light has to disperse in all directions, while for the parallel light, it just goes straight ahead.

Explanation / Answer

d)The change is faster for the point source because the light has to disperse in all directions, while for the parallel light, it just goes straight ahead

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