Three prisms 1, 2 and 3 have the prism angle `A = 60^(@)`, but their refractive indices are respectively 1.4, 1.5 and 1.6. If `delta_(1), delta_(2), delta_(3)` be their respective angles of deviation then
A. `delta_3gtdelta_2gtdelta_1`
B. `delta_1gtdelta_2gtdelta_3`
C. `delta_1=delta_2=delta_3`
D. `delta_2gtdelta_1gtdelta_3`