Given a triangular prism, right angle, and isosceles made of glass. A beam of light moves in a vacuum and hits the edge of the prism perpendicular to it as in the diagram. 

A. If given that the refractive index of the prism is n = 1.3. Calculate the refractive angle of the light beam coming out of the prism (the angle between the outgoing beam and the vertical to the surface).
B. If it is given that the beam does not break out, but undergoes a full return inside the prism, what is the minimum possible refractive index of the material from which the prism is made.

n