Final answer:
When light passes from air into water or a glass lens at an angle, its path bends due to refraction.
Step-by-step explanation:
When a light ray passes from air into water or a glass lens at an angle, its path bends.
This is due to a property called refraction, which occurs when light travels from one medium to another with a different optical density.
The amount the light ray bends depends on the angle of incidence and the refractive index of the materials involved.
Learn more about Refraction of light