Final answer:
Snell's Law describes the relationship between the angles and indices of refraction when light travels through two different media. The formula is n1 sin θ1 = n2 sin θ2, where n represents the indices of refraction and θ represents the angles of incidence and refraction.
Step-by-step explanation:
Snell's Law, also known as the law of refraction, is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as air and water.
The mathematical expression for Snell's Law is given by:
n1 sin θ1 = n2 sin θ2
Where n1 and n2 are the indices of refraction for the first and second medium, respectively, and θ1 and θ2 are the angles between the rays and the normal to the surface at the point of incidence in their respective media.
For example, when the incident angle equals the critical angle (θ1 = θc), the angle of refraction (θ2) will be 90 degrees, simplifying Snell's Law to n1 sin θ1 = n2, considering that sin 90° = 1.