The formula to calculate the Prism Refraction Angle (PRA) is:
PRA=AOI+AOE−AOD
Where:
Let's say the angle of incident (AOI) is 30 degrees, the angle of emergence (AOE) is 40 degrees, and the angle of deviation (AOD) is 10 degrees. Using the formula:
PRA=30+40−10=60 degrees
So, the prism refraction angle is 60 degrees.