Final answer:
Refraction is the bending of light as it passes from one medium to another, which is best exemplified when light passes through a lens.(Option B)
Step-by-step explanation:
The refraction of light rays is best described as the bending of light when it passes from one medium to another, due to a change in speed. This occurs because light travels at different speeds in different media. For instance, light bends toward the normal when entering a medium with a higher index of refraction.
Therefore, the correct answer to the question, 'What best describes the refraction of light rays?' would be B. light bending when it passes through a lens. This is because a lens is a medium through which light is transmitted and the change in medium causes the light to refract.