Q1. What is refraction of light?
Light changes its direction when going from one transparent medium to another transparent medium. This change in direction is called the refraction of light.
For example, the coin appears to disappear in a vessel when viewed from a specific angle. But as soon as the water is poured into the vessel at a certain level, the coin appears. This phenomenon is because light rays coming from the coin emerge out of the water and change their direction due to the refraction of light.