Question

What is it called when light changes direction after leaving a lens?​

Answer 1

Lenses serve to refract light at each boundary. As a ray of light enters a lens, it is refracted; and as the same ray of light exits the lens, it is refracted again. The net effect of the refraction of light at these two boundaries is that the light ray has changed directions.

Answer 2

Answer:

For a lens it is called refraction. ... Refraction is the change in the direction of light when passing from one transparent medium to another. The phenomenon of refraction takes place because of the difference in speed in different media.