Lensing equations

Lensing equations describe how gravity from a massive object, like a galaxy or black hole, bends the path of light coming from a distant source. Imagine the gravity as a cosmic lens, changing the light’s trajectory and sometimes magnifying or creating multiple images of the distant object. These equations relate the positions of the source, lens, and observed images, allowing scientists to understand and model this bending effect. They help us study distant cosmic objects and the distribution of mass in the universe by analyzing how light is warped by gravity.