Question

For light diverging from a point source
A. the wavefront in 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 1

Correct Answer - A::B
wave front light of point source is spherical. Intensity of light emited by plane source of constant power `P, I = (P)/(4pi r^(2))`