Question

A laserbeam in air strikes the flat surface of a sheet of glass (ng= 1.50) at an angle of incidence of 30.0 degrees. Rather than continuing straight into the glass the beam bends toward the normal through an angle Thetad, called the deviation angle. Determine that angle.

Answer 1

Applying Snells Law

=> 1 * sin30 = 1.50 * sin(r)

=> r = 19.47 degree

=> the deviation angle =   30 - 19.47

                                       =   10.53 degree