Here's how it works:
1. Speed Change: The wave's speed changes because the new medium has a different density and/or elastic properties. For example, light travels slower in water than in air.
2. Angle of Incidence: The angle at which the wave hits the boundary between the two media is called the angle of incidence.
3. Angle of Refraction: The angle at which the wave travels in the new medium is called the angle of refraction.
4. Snell's Law: The relationship between the angles of incidence and refraction, and the speeds of the wave in the two media, is described by Snell's Law:
* n₁sinθ₁ = n₂sinθ₂
Where:
* n₁ and n₂ are the refractive indices of the first and second media, respectively.
* θ₁ and θ₂ are the angles of incidence and refraction, respectively.
Important Notes:
* Refraction can occur with all types of waves: Light, sound, water waves, etc.
* If the wave travels into a medium where it moves slower, it will bend towards the normal (an imaginary line perpendicular to the boundary).
* If the wave travels into a medium where it moves faster, it will bend away from the normal.
Examples of Refraction:
* A straw in a glass of water appears bent: Light from the straw travels faster in air than in water, so it bends as it enters the water, making the straw look bent.
* A rainbow: Light from the sun is refracted through water droplets in the atmosphere, separating the colors and creating a rainbow.
Refraction is a fundamental phenomenon in wave physics and has many important applications in technology and our everyday lives.
