All Problems Polarization of Light
Problem 5.173
Using the Fresnel equations, find: (a) the reflection coefficient of natural light falling normally on the surface of glass; (b) the relative loss of luminous flux due to reflections of a paraxial ray of naturallight passing through an aligned optical system comprising five glass lenses (secondary reflections of light are to be neglected).
\[ \text { 5.173. (a) } \rho=(n-1)^{2} /(n+1)^{2}=0.040 \] (b) \(\Delta \Phi / \Phi=1\) \(-(1-\rho)^{2 N}=0.34,\) where \(N\) is the number of lenses.