Brewsters Angle Calculator


In the realm of optics and physics, Brewster’s angle holds significant importance. It refers to the angle at which light is completely polarized when reflected from a transparent surface. Calculating Brewster’s angle accurately is crucial in various optical applications. To facilitate this, we present a Brewster’s angle calculator along with a detailed article on its usage and formula.

How to Use

To utilize the Brewster’s angle calculator, simply input the refractive index of the medium through which light is passing. Then, click the “Calculate” button to obtain the result.


Brewster’s angle (θB​) can be calculated using the formula:


  • θB​ = Brewster’s angle
  • n1​ = Refractive index of the medium where light is coming from
  • n2​ = Refractive index of the medium where light is going to

Example Solve

Let’s consider an example where light is traveling from air (with a refractive index of approximately 1.00) to glass (with a refractive index of around 1.50). Plugging these values into the formula, we get:


So, Brewster’s angle for this scenario is approximately 56.31∘.


Q: What is Brewster’s angle?
A: Brewster’s angle is the angle at which light becomes completely polarized when reflected from a transparent surface.

Q: Why is Brewster’s angle important?
A: Brewster’s angle is crucial in optics as it helps in controlling the polarization of light, which is vital in various applications like glare reduction, anti-reflection coatings, and optical filters.

Q: How can Brewster’s angle be used practically?
A: Knowledge of Brewster’s angle is applied in designing polarizing sunglasses, reducing glare from water surfaces, and improving the efficiency of optical devices.


Understanding Brewster’s angle and being able to calculate it accurately is essential in the field of optics. With the provided Brewster’s angle calculator and the insights shared in this article, you can easily determine this critical angle for your optical setups.

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