For refractin of light through a prism
A. For every angle of deviation there are two angles of incidence
B. The light travelling inside an equilateral prism is necessarily parallel to the base when prism is set for minimum deviation
C. There are two angles of incidence for maximum deviation
D. Angle of minimum deviation will increase if refractive index of prism `(mu_(P))` is increased keeping the refractive index of the outside medium `(mu_(S))` unchanged if `mu_(P) gt mu_(S)`.