A ray of light is incident from a denser...

A ray of light is incident from a denser to a rarer medium. The critical angle for total internal reflection is `theta_(ic)` and Brewster's angle of incidence is `theta_(iB)` such that `(sintheta_(ic))/(sintheta_(iB))= eta=1.28` . The relative refractive index of the two media is

0.4

0.2

0.9

0.8

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