* Refraction: When light travels from one medium (like air) to another (like water or glass), it changes speed. This change in speed causes the light to bend, or refract. The angle at which the light bends depends on the angle of incidence (the angle at which the light hits the surface) and the refractive indices of the two materials.
* Think of it like this: Imagine you're walking from a sidewalk onto a grassy field. If you walk straight, you'll continue in a straight line. But if you approach the field at an angle, your path will bend because you're moving slower on the grass. Light does the same thing when it changes media!
Examples of refraction in action:
* A straw in a glass of water: The straw appears to bend at the surface of the water because the light from the straw refracts as it passes from water to air.
* Rainbows: Rainbows form when sunlight is refracted and reflected by raindrops.
* Lenses: Lenses in eyeglasses, telescopes, and cameras use refraction to focus light.
Let me know if you'd like to learn more about how refraction works or any other aspect of light!
