Snell θ₂
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Snell θ₂ Calculator is an online tool that allows you to calculate the refraction angle θ₂ when light passes from one medium to another with different refractive indices. Snell's law is fundamental in optics and describes how light behaves when changing media.
The formula used is sin θ₂ = n₁·sin θ₁/n₂, where n₁ and n₂ are the refractive indices of media 1 and 2, respectively, and θ₁ is the angle of incidence. With this calculator, you can quickly determine the refraction angle θ₂.
Snell's law is applied in various situations, such as in the study of lenses, prisms, and optical fibers. It is essential to consider the refractive indices of the media involved and the angle of incidence to obtain accurate results.
When using this calculator, it is crucial to be mindful of the units of measurement and ensure that the input values are consistent with the physical properties of the media involved.
Frequently asked questions
What is Snell's law?
Snell's law is a formula that describes how light behaves when passing from one medium to another with different refractive indices.
What are the units of measurement for refractive indices?
Refractive indices are dimensionless, meaning they have no units of measurement.
How can I use this calculator to find the refraction angle?
Simply enter the values of the refractive indices and the angle of incidence, and the calculator will provide the refraction angle θ₂.
Does Snell's law only apply to visible light?
No, Snell's law applies to any type of electromagnetic wave.
What are the limitations of Snell's law?
Snell's law assumes that the media are isotropic and homogeneous, and that light travels in a straight line.