Physics · Ray Optics

In a standard graph of the angle of deviation (δ) versus the angle of incidence (i) for a light ray striking a triangular prism, the minimum deviation occurs when i1 = i2. If the minimum angle of deviation is 30° for an equilateral prism, or if the plot shows a standard symmetric minimum, what is the typical prism angle (A) associated with a standard 60° equilateral prism?