Here's why:
* Refraction: This is the bending of light as it passes from one medium to another. The change in speed causes the light to change direction.
* Angle of Incidence and Refraction: The angle at which light strikes a surface is called the angle of incidence. The angle at which it bends upon entering the new medium is the angle of refraction.
* Snell's Law: This law describes the relationship between the angles of incidence and refraction, and the indices of refraction of the two media. It quantifies how much the light bends.
Examples of Refraction:
* A straw in a glass of water: The straw appears bent because light from the straw is refracted as it passes from the water (higher refractive index) to the air (lower refractive index).
* A rainbow: Sunlight is refracted as it passes through water droplets in the atmosphere, separating the colors of the spectrum.
Let me know if you'd like more details on any of these concepts!
