Q. When light passes from one medium to another, this phenomenon of change in its direction is called ___.
Answer: Refraction
Notes: The phenomenon of bending of light as it passes from one medium to another is known as the refraction of light. Refraction is the change in direction of a wave due to a change in its medium. It is essentially a surface phenomenon. This is most commonly observed when a wave passes from one medium to another at any angle other than 0° from the normal.