Inverse Square Law

Did this experiment using a speedlight, my trusty old light meter and a steel tape. You will notice that between 10cm to 40cm, the jump between apertures are significantly wide but on the 50cm mark onwards, aperture gaps between reading is relatively close.

I never thought I’d be writing about this particular branch of science that covers the characteristics of light. Because photography is all about capturing light, we need to understand how it behaves. It’s a bit technical if you try to put numbers on it and start making a mathematical computation out of it.

The inverse square law is surprisingly very much applicable to photography especially if you’re using artificial lights or strobes. It might seem obvious on how light behaves since we experience it everyday but you’ll be surprised to know that some of your understanding of light is quite different from what actually happens.

The inverse square law is defined as the intensity of an effect such as illumination or gravitational force changes in inverse proportion to the square of the distance from the source. Stop, don’t panic! This is a general law in physics that applies to any electromagnetic wavelength and that includes the light. Continue reading “Inverse Square Law” »