Photographic term Inverse square law SWPPFoundations in Portrait Lighting

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Term - Inverse square law

Inverse square lawSWPP Photographic Glossary

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Inverse square law

A simple mathematical law thatís 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.


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