Enter the refractive indices of two different mediums and the angle of refraction into the calculator to determine the angle of incidence.

## Angle of Incidence Formula

The following formula is used to calculate the angle of incidence.

θ_{1} = sin^{-1 } ( n2 * sin (θ_{2}) / n1 )

- Where θ
_{1}is the angle of incidence - θ
_{2}is the refraction angle - n2 is the refractive index of medium 2
- n1 is the refractive index of medium 1

## Angle of Incidence Definition

An angle of incidence is defined as the angle between the ray incident on a surface and the line perpendicular to the surface.

## Angle of Incidence Example

How to calculate the angle of incidence?

**First, determine the refractive indices.**Calculate the refractive index of both mediums.

**Next, determine the angle of refraction.**Calculate or measure the refraction angle.

**Finally, calculate the angle of incidence.**Calculate the angle of incidence using the equation above.

## FAQ

**What is a refraction?**

A refraction is defined as the change in the relative angle of reflected light based on the speed of light through two different mediums.