Example 24 Monochromatic light is incident on a plane interface AB between two media of refractive indices n and n n2 n at an

Question

Example 24 Monochromatic light is incident on a plane interface AB between two media of refractive indices n and n n2 n at an angle of incidence 0 as shown in fig 33 The angle 9 is MEDIUM I A D G MEDIUM III 13 MEDIUM II n E F B Fig 33 infinitesimally greater than the critical angle for the two media so that total internal reflection takes place Now if a transparent slab DEFG of uniform thickness and refractive index n is introduced on the interface as shown in figure show that for any value of n3 all light will ultimately be reflected back again into medium II Consider

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