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Physics

Brewster Angle Calculator

Calculate the ideal Brewster angle at a dielectric interface.

SI units shown beside each fieldIdeal model explained below
Physics lab
Physics lab

Use the units beside each input and review the model assumptions.

See the method

Define your system

Runs on your device

Your calculated quantity

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter incident index, transmitted index.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Brewster angle = atan(n2/n1).

A WORKED EXAMPLE

Using incident index = 1, transmitted index = 1.5, the result is 56.3099325 degrees. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

Nonmagnetic, transparent dielectric media. This is the p-polarized zero-reflection angle, not a claim that all polarization is transmitted.

What to keep in mind

Nonmagnetic, transparent dielectric media. This is the p-polarized zero-reflection angle, not a claim that all polarization is transmitted. 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 brewster angle calculator?

Calculate the ideal Brewster angle at a dielectric interface. Enter incident index, transmitted index. The starting example is editable; use values for the same system or project.

Which assumptions affect this result?

Nonmagnetic, transparent dielectric media. This is the p-polarized zero-reflection angle, not a claim that all polarization is transmitted.

Methodology maintained by ClarityKit. How these tools are built and checked.