* Refraction: The bending of light as it passes from one medium to another is called refraction. This bending occurs because the speed of light changes as it moves from one medium to another.
* Snell's Law: The relationship between the angle of incidence (the angle at which light hits the surface) and the angle of refraction (the angle at which light bends) is described by Snell's Law:
* n₁ sin θ₁ = n₂ sin θ₂
* where n₁ and n₂ are the indices of refraction of the two media, and θ₁ and θ₂ are the angles of incidence and refraction, respectively.
* Index of Refraction: The index of refraction is a measure of how much light slows down in a medium. A higher index of refraction means the light travels slower.
* Equal Speeds, Equal Indices: If the speed of light is the same in both air and water, then their indices of refraction would be equal. This means that n₁ = n₂ in Snell's Law.
* No Bending: If n₁ = n₂, then sin θ₁ = sin θ₂, which means that θ₁ = θ₂. This indicates that the angle of incidence and the angle of refraction are the same, meaning there is no bending of the light beam.
In reality: The speed of light is slower in water than in air, leading to the familiar bending of light beams as they enter water. This is why objects underwater appear to be in a slightly different position than they actually are.
