It is the bending of light as it passes through some medium to another with a different density.
Refraction
What are the two things that the amount of bending depends on?
It is a lens that bulges outward. When light passes through this lens, it will meet at a particular point, also known as the “Converging Lens”
Convex Lens
It is a lens that bulges inward. When light passes through this lens, the light rays diverge from each other, also known as the “Diverging Lens”
Concave Lens