211. Choose the true statement about the extraordinary radius obtained by the phenomenon of birefringence:A. is eliminated after penetration into NicolB. undergoes total reflection on the diagonal face of the crystalC. for this radius the refractive index of Canada balsam is much lower than that of Iceland sparD. for this radius the refractive index of Canada balsam is much higher than that of Iceland sparE. for this radius the refractive index of Canada balsam is almost identical to thatof Iceland spar

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