# Snell's Law Calculator

The Snell's Law Calculator is a free tool that calculates the angle of refraction in a fraction of a second using the Snell's Law Formula. All you should do is fill in the boxes in the input fields and press the calculate button to get instant results.

### How to use the Snell's Law Calculator?

The following is how to use Snell's law calculator to obtain the angle of refraction in the Snell's Law

- In the input area, Enter the refraction index of the first and second mediums of refractive index n
_{1}and n_{1}, the angle of incidence θ_{1}. - Simply put the inputs as n
_{1},n_{2}and θ_{1} - To calculate the angle of refraction θ
_{2}press the calculate button. - Finally,To get the angle of refraction is calculated from the snell's law calculator.

### Snell's Law of Refraction

**Snell's Law of refraction** states that when a light ray passes through a different medium, its wavelength and speed change. The beam bends in one of two directions: towards or away from the media boundary. Angle of Refraction is determined by the refraction indices of both media.

The Formula for the Snell's Law of Referaction: **n _{1}sin(θ_{1})=n_{2}sin(θ_{2})**

Where,

- The first medium of refractive index is n
_{1}. - The refractive index of second medium is n
_{2}. - The angle of incidence, which is the angle formed by the line normal to the border between two media and the incoming ray is θ
_{1}. - The angle of refraction is the angle formed by the normal to the boundary and the ray travelling through the medium is θ
_{2}.

For more concepts check out physicscalculatorpro.com to get quick answers by using this free tool.

### Snell's Law Example

**Question 1:**How do you calculate the angle of refraction of a light beam that passes through air and into glass? If the Angle of Incidence is 35°, the refractive index of air is 1.000233, and the refractive index of glass is 2.5, what is the refractive index of air?

**Solution:**

Consider the problem

**We have the inputs are,**

The first medium of refractive index, n_{1}= 1.000233

The second medium of refractive index, n_{2}= 2.5

The angle of incidence, θ_{1}= 35°

**Formula:** We know that, Angle of refraction**(θ _{2}) = sin^{-1}(n_{1}*sin(θ_{2})/n_{2})**

By substituting the inputs in the previous formula, we get the following equation.

Angle of refraction(θ_{2}) = sin^{-1}( 1.000233 *sin(35°) / 2.5)

Angle of refraction(θ_{2}) = 13.3°

Therefore, the angle of refraction(θ_{2}) of a light beam is 13.3°

### FAQs on Snell's Law Calculator

**1. How do you calculate the angle of Refraction using Snell's Law?**

The Snell's Law Formula can be used to compute the angle of refraction: **n _{1}sin(θ_{1})=n_{2}sin(θ_{2})**

Where,

- The first medium of refractive index is n
_{1}. - The refractive index of second medium is n
_{2}. - θ
_{1}be the angle of incidence - θ
_{2}be the angle of refraction

**2. In which cases does Snell's Law not apply?**

When the angle of incidence is zero, Snell's Law does not apply because the angle of refraction is likewise zero.

**3. What is the purpose of Snell's Law?**

When light or other waves flow through a border between two isotropic mediums,Snell's Law describes the relationship between angle of incidence and refraction.