Light, leaving a point source, spreads out so that the apparent brightness, b, of light per unit area varies with distance d according to which law ( $\alpha$ means "proportional to")?

Question

Quizplus · Accepted Answer

The apparent brightness of light from a point source follows the inverse square law, meaning it is inversely proportional to the square of the distance from the source.

Light, Leaving a Point Source, Spreads Out So That the Apparent