When lights enteres a denser medium than one from which it is coming it refracts
That is correct. When light enters a denser medium, such as going from air to water or from air to glass, it changes direction or bends. This phenomenon is called refraction. The change in direction occurs because the speed of light changes as it moves from one medium to another, resulting in the bending of the light ray.
Yes, that's correct. When light passes from one medium to another, such as from air to water or from air to glass, it undergoes refraction. Refraction is the bending of light as it passes through a boundary between two different substances.
When light travels from a less dense medium (like air) to a denser medium (like water or glass), it slows down and bends towards the normal, which is an imaginary line perpendicular to the surface of the boundary. The angle of refraction is smaller than the angle of incidence, which is the angle at which the light ray strikes the boundary.
This change in direction occurs because light travels at different speeds in different substances. Each substance has a characteristic property called the refractive index, which determines how much the light bends when it crosses the boundary.
It's important to note that the direction of refraction depends on the relative densities of the two substances. If light were to travel from a denser medium to a less dense medium, it would instead bend away from the normal.