For light diverging from a point source

Options

A. the wavefront is spherical
B. the intensity decreases in proportion to the distance squared
C. the wavefront is parabolic
D. the intensity at the wavefront does not depend on the distance

Answer

A, B

Explanation

For light diverging from a point source, the wavefront is (diverging) spherical wavefront. The intensity varies inversely as the area of the wavefront `(= 4 pi r^(2))`, i.e., intensity decreases in proportion to the distance squared.