Final answer:
Refraction is the bending of light when it passes through a medium of different optical density. It causes light to change direction and is responsible for various everyday phenomena.
Step-by-step explanation:
The bending of light is known as refraction. Refraction occurs when light passes through a medium of different optical density, such as the air to glass or water. As light travels from one medium to another, its speed and direction change, causing it to bend. This bending of light is responsible for various phenomena, such as the apparent bending of a pencil when placed in a glass of water.
Learn more about Refraction of light