A Point Is on A $4 \mathrm{~m}$ Long Line Between Light $\mathrm{A}$

Short Answer

A point is on a $4 \mathrm{~m}$ long line between Light $\mathrm{A}$ and Light $\mathrm{B}$ . Light $\mathrm{B}$ is 3 times as bright as Light $\mathrm{A}$ . The intensity of light at a point is proportional to the brightness of the light divided by the square of the distance from the light to the point. Find the distance of the point from A that minimizes the intensity of the light at the point.