In the given figure, what is the angle of prism

What is angle of prism ?

The plot of deviation (delta) vs angle of incidence (i) for a prism is as shown in the figure. Find the angle of the prism (A).

For a glass prism mu=sqrt(3) ,the angle of minimum deviation is equal to the angle of the prism.Find the angle of prism.

In the figure given below what is the measure of angle BYX ?

In the figure given below, what is the measure of angle CBA ?