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Sajan sarthak Best Answer
1.658 is the refractive index of slow ray
i m a bit confused.
why
RI of O RAY=1.486-0.172 ???because birefringence=RI of e ray-ri -RI of O ray
then it is coming 1.314
birefringence=(slowray -fast Ray) refractive index
study theses attached file