Question: Monochromatic light is incident on the plane interface AB between two media of refractive indices and H () at an angle of incidence 0

Monochromatic light is incident on the plane interface AB between two media

Monochromatic light is incident on the plane interface AB between two media of refractive indices and H () at an angle of incidence 0 as shown in figure (18-W8). The angle is 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 of refractive index , is introduced on the interface (as shown in the figure), show that for any value of , all light will ultimately be reflected back into medium II. Medium I () A D G Medium III (3) 0 Medium II () E LL F B

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