Question

a beam of light passes from air to a substance x. if angle of incidence is 45degres and angle of refraction is 30 degrees calculate thevrefractive index of substance X

Answer 1

we know that the
refractive index = sin i / sin r
                         = sin 45 / sin 30
                        = 1 /  1/2
                        = 2
Therefore , the refractive index of this substance (x) is 2.