Which is harder gold or quartz?
The refractive index of fused glass quartz is 1.46. To solve this question we need to use Snell's Law: n1 sinx1 = n2 sinx2 where n1 = refractive index of air = 1 x1 = angle of incidence n2 = refractive index of FGQ = 1.46 x1 = angle of refraction = 24 degrees So sinx1 = 1.46 sin24 = 0.59 and taking the inverse sine gives 36 degrees.
