Light travels in straight lines and lets us see.
When light hits a mirror it reflects (bounces off). When light passes from one material into another (like air into water) it bends — this is refraction. Lenses use refraction to focus light, as in a magnifying glass, a camera and the human eye.
Remember
- Reflection = light bounces off; refraction = light bends.
- Lenses focus light (eye, camera, magnifying glass).