If the Polarising Angle for Cubic Zirconia (Zirconium Oxide) Is $\degree$

Multiple Choice

If the polarising angle for cubic zirconia (zirconium oxide) is 65.6 $\degree$ , what is the index of refraction of the material?

A) 1.84
B) 2.00
C) 2.20
D) 2.43
E) 1.17