Gravitational lensing is a phenomenon predicted by Einstein's theory of general relativity, where the gravitational field of a massive object, like a galaxy or a cluster of galaxies, bends and distorts the path of light from a background source, such as a quasar. This distortion can create multiple images of the same quasar or even amplify its brightness, allowing us to study distant and faint objects that would otherwise be difficult to observe.
Quasars are incredibly luminous and distant objects believed to be powered by supermassive black holes at the centers of galaxies. When a quasar's light is gravitationally lensed, it can provide valuable insights into the distribution of dark matter and the properties of massive objects in the universe.
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