ClarityHow to use this tool
- Enter incident refractive index, transmitted refractive index, angle from normal.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
The method, explained
n1 sin(θ1)=n2 sin(θ2). If the computed sine exceeds one, total internal reflection occurs.
Using incident refractive index = 1, transmitted refractive index = 1.5, angle from normal = 30 degrees, the result is 19.4712206 degrees. Change these example inputs to match your task; use the method above to check each step.
Understanding your result
Angles are measured from the surface normal. Homogeneous isotropic media and a single wavelength are assumed.
What to keep in mind
Angles are measured from the surface normal. Homogeneous isotropic media and a single wavelength are assumed. An idealized educational model using the stated SI units. Real systems may need additional forces, losses or experimental measurements. Not a safety or equipment specification.
Common questions
How do I use this snell’s law calculator?
Find refraction angle from two refractive indices and the incidence angle. Enter incident refractive index, transmitted refractive index, angle from normal in degrees. The starting example is editable; use values for the same system or project.
Which assumptions affect this result?
Angles are measured from the surface normal. Homogeneous isotropic media and a single wavelength are assumed.
Methodology maintained by ClarityKit. How these tools are built and checked.