Question

How to find the refractive index of glass when wavelength of light=650, angle of refraction=28.1, speed of light in air=1c and speed of light in glass=.67c.

Answer 1

$n_{\text{glass}}=\frac{v_{\text{air}}}{v_{\text{glass}}}=\frac{c}{0.67c}\approx1.49$