The intensity of light itself does not change due to the effect of gravity. Gravity primarily affects the motion of objects and the curvature of spacetime, but it does not directly alter the intensity of light. However, gravity can indirectly affect the intensity of light by causing gravitational lensing.
Gravitational lensing occurs when light from a distant source passes through the gravitational field of a massive object, such as a galaxy or a black hole. The gravitational field bends the path of light, causing it to follow a curved trajectory. In some cases, this gravitational bending can lead to the amplification or magnification of the light, increasing its intensity. This phenomenon is known as gravitational lensing.
Gravitational lensing is a fascinating effect predicted by Einstein's theory of general relativity. It has been observed and studied by astronomers, providing valuable insights into the nature of gravity and the distribution of matter in the universe.