Jane's Flashy Boy Friend Has Just Given Her a Ring

Multiple Choice

Jane's flashy boy friend has just given her a ring with a huge "diamond". Jane, who has studied physics, measures the polarizing angle for the stone and finds that the polarizing angle is 62.97°. The stone is

A) fluoride, n = 1.560.
B) crown glass, n = 1.517.
C) spinel, n = 1.712.
D) zircon, n = 1.960.
E) diamond, n = 2.417.