(Solved): Consider the total internal reflection of a laser beam of wavelength 532 nm in air, focusing on a pr ...

Consider the total internal reflection of a laser beam of wavelength 532 nm in air, focusing on a prism of right angle, as shown in the figure. The incident and reflected beams are orthogonal and the refractive index of the prism is 1.5. to what distance from the interface, the amplitude of the electric field of the evanescent wave falls to 1/e of its value in the interface?