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na, nb and nc are refractive indices of ...

`n_a, n_b` and `n_c` are refractive indices of three media A, B, C respectively for a particular wavelength such that `n_a> n_b> n_C`. Total internal reflection is possible when light travels from

A

C to A

B

C to B

C

B to A

D

A to C.

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