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For light diverging from a point source,

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the intensity at the wavefront does not depend on the distance

the intensity decreases in proportion to the distance squared

the wavefront is spherical

the wavefront is parabolic

answer is A, B.

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Detailed Solution

Consider the diagram in which light diverges from a point source (O).

Due to the point source light propagates in all directions symmetrically and hence, wavefront will be spherical as shown in the diagram. If power of the source is P, then intensity of the source will be

$I = \frac{P}{4 {πr}^{2}}$

where, r is radius of the wavefront at any time.

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