Question

what is refraction of li...
visible light travels in a straight line until something gets in the way
refraction occurs when light slows down as it travels through different mediums. mediums are things like water, diamonds, glass, and air. when light slows down it appears distorted
the index of refraction is a scale that gives us a value of how much light will slow down. if light travels fastest through a vacuum and slows down as it goes through different mediums. as the number value on the index of refraction increases, the speed of light decreases
the speed of light changes as it goes through different mediums. what does this cause?
it causes light to stop traveling.
it causes light to bend at right angles.
it causes light to change direction or appear distorted.

Explanation:

Light refraction occurs when light's speed changes through different mediums. This speed - change causes light to change direction or appear distorted. Light doesn't stop (as it's still moving, just at a different speed). Bending at right angles is too specific; refraction can cause various angles of bending, not just right - angles.

Answer:

It causes light to change direction or appear distorted.