Light having a vacuum wavelength of 600 nm, traveling in aglass (ng = 1.50) block, is inci...

Light having a vacuum wavelength of 600 nm, traveling in a

glass (ng = 1.50) block, is incident at 45° on a glass-air interface. It is then totally internally reflected. Determine the distance into the air at which the amplitude of the evanescent wave has dropped to a value of 1/e of its maximum value at the interface.