Question

A beam of light makes an angle of θi = 53.0˚ with the normal of a slab of transparent material of t=3.80 mm-thickness. The index of refraction of the glass is n2 = 1.39.
Angle 3 is 53.1
b) How far vertically (d) is the point at which the beam leaves the glass surface from the point at which the beam entered the glass? Provide the answer in mm.