A rectangular glass slab ABCD, of refractive index, n 1 is immersed in water of refractive index n 1 (n 1 > n 2 ). A ray of light is incident at the surface AB of the slab, as shown. The maximum value of the angle of incidence 
max , such that the ray comes out only from the other surface CD, is given by
Text Solution
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Consider the figure. The ray will come out from CD if it suffers a total internal reflection at surface AD, i.e., it strikes the surface AD at critical angle C (the limiting case).
Applying Snell's law at P, we get
or 
Applying snell's law at Q, we get
or 
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