Visual Angle Calculator

Formula

The formula to calculate the Visual Angle (VA) is:

\[ VA = \arctan \left( \frac{S}{D} \right) \]

Where:

\(VA\) is the Visual Angle (degrees)
\(S\) is the visual size
\(D\) is the distance

Visual Angle Definition

The visual angle is the angle formed by the size of an object and the distance from the observer. It is used in various fields such as vision science, optics, and photography to describe how large an object appears to an observer.

Example Calculation

Let's assume the following values:

Visual Size (S) = 5 units
Distance (D) = 20 units

Using the formula to calculate the Visual Angle (VA):

\[ VA = \arctan \left( \frac{5}{20} \right) \approx 14.0362 \, \text{degrees} \]

The Visual Angle (VA) is approximately 14.0362 degrees.