A simple mathematical law thatâ€™s usually complicated by its description. The law states that light projected onto a surface is inversely proportional to the square of its distance from the source! See what I mean? Basically if you shine a light on a subject and then move it to twice the distance the subject will receive a quarter of the intensity. Similarly when you half the distance the intensity is multiplied by four.

ephotozine An equation that relates the intensity of a light source to the illumination it produces at a given distance. Light diminishes over distance in accordance with the Inverse square law, which states that doubling the flash-to-subject distance reduces the light falling on the subject to one-quarter.

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This law of physics indicates that when you increase the distance between a subject to twice as far away from a light source, it will then receive one quarter of the light. So, when you move a subject twice as far from the original light source, you will need to increase the amount of light four times.

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