question_answer

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 \[\sin {{\theta }_{iC}}/\sin {{\theta }_{iB}}=\eta =1.28.\]The relative refractive index of the two media is:

A)  0.2

B) 0.4    

C)  0.8

D) 0.9