Which of the following statement (s) is/are true?

Options

A. In vaccum the speed of red colour is more than that of violet colour
B. An object in front of a mirror is moved towards the pole of a spherical mirror from infinity, it is found that image also moves towards the pole. The mirror must be convex
C. There exist two angles of incidence in a prism for which angles of deviation are same except minimum deviation
D. A ray travels from a rarer medium to denser medium. There exist three angles of incidence for which the deviation is same

Answer

B, C

Explanation

(a) If vacuum speed of light of all colours is same.
(b)
If object moves from `oo to P`, then its vertual,
erect and diminished image move from F to P.
(c)