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**Table of Content**

The angle of deviation calculator calculates the angle of deviation by the ratio of the angle of incidence and the angle of emergence relative to a prism.

The angle of deviation of prisms can be different due to the different materials used in the production of the prisms. The angle of the deviation of a prism is equal to the sum of the angle of incidence and emergence angle minus the angle of the prism.

The formula for calculating the angle of deviation is:

**Angle of Deviation = Angle Of Incidence + Angle of Emergence – Angle of Prism**

**D = I + E – A**

Consider the angle of the incident (I) is 10 degrees, the angle of emergence (E) is 35 degrees and the prism angle (A) is 35 degrees. Then what is the angle of deviation (D) of the incident ray?

I = 10 degrees

E = 35 degrees

A = 35 degrees

D =?

Now the formula of the angle of deviation is:

**D = I + E – A**

Now by putting the values in the formula:

D = I + E – A

D =10 +35 – 35

Evaluating

D= 10

**Angle of Deviation = D = 10 degrees**

Factors on which the angle of deviation depends are:

- The angle of incidence
- The wavelength of light used
- The material of the prism
- The angle of the prism

Using our calculator needs no effort! Everything is easy to input and you can get straightforward results. Let’s find out how!

**Input:**

- Enter the angle of incident, angle of emergence, and the angle of the prism
- Select the unit of the angle of deviation
- Tap
**Calculate**

**Output:**

- Angle of deviation
- Step-by-step calculation

Yes, the deviation angle can be negative if the refractive light bends downward. The angle of deviation calculator estimates both the upward and downward refraction angle of deviation.

When the angle of incidence is 90 degrees, the maximum deviation occurs.

The Violet light has the maximum deviation as it has the shortest wavelength.

From the source of Wikipedia: Minimum deviation, Formula

From the source of the toppr.com: Angle of deviation, Factors affecting Deviation