Light leaving a point source spreads out so that the apparent brightness I of light per unit area varies with distance d according to which of these laws ($\infty$ means "proportional to")? A) I = constant B) I $\infty$ 1/d² C) I $\infty$ d² D) I $\infty$ 1/d

Question

Quizplus · Accepted Answer

The apparent brightness of light from a point source decreases with the square of the distance from the source, following the inverse square law, which is represented as $I \propto \frac{1}{d^2}$.

Light Leaving a Point Source Spreads Out So That the Apparent