For refractin of light through a prism

Options

A. For every angle of deviation there are two angles of incidence.
B. The light travelling inside an isosceles prism is necessarilly 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 refrative index of prism is increased keeping the outside medium unchanged.

Answer

c,d

Explanation

(A) is not true for minimum deviation.
(B) is true only if refracting side are equal.
(C) Tow angles for maximum deviation are `90^(@)` and `i_(min)` .
(D)`delta_(min)=(mu-1)A` .