A gravitational lens is a phenomenon in which the gravitational field of a massive object, such as a galaxy or a cluster of galaxies, bends and distorts the light from a more distant object, like a quasar or another galaxy. This gravitational bending acts as a lens, magnifying and altering the appearance of the background object.
The bending of light occurs due to the warping of spacetime around massive objects, as predicted by Einstein’s general theory of relativity. This effect can lead to the formation of multiple images, arcs, or even complete Einstein rings of the background source.
Gravitational lensing has become a valuable tool in astrophysics, allowing astronomers to study distant and faint objects that would otherwise be challenging to observe. It provides insights into the distribution of matter in the universe and helps in probing the nature of dark matter.
