Here's a breakdown:
* Refraction: The change in direction of a wave as it passes from one medium to another. This happens because the wave's speed changes as it enters the new medium.
* Medium: A substance that a wave can travel through. Examples include air, water, glass, and even vacuum.
* Speed of Wave: The speed at which a wave travels through a medium depends on the properties of the medium. For example, light travels faster in air than in water.
How Refraction Works
When a wave enters a new medium, it changes direction because the speed of the wave changes. The amount of bending depends on:
* The angle at which the wave strikes the boundary between the two media (the angle of incidence).
* The difference in speed of the wave in the two media (the refractive index).
Examples of Refraction
* Light: When light passes from air to water, it slows down and bends towards the normal (an imaginary line perpendicular to the surface). This is why a straw in a glass of water appears bent.
* Sound: Sound waves also refract. This is why you can hear sounds from around corners, even if you can't see the source.
Let me know if you'd like more details or examples!
