How to find the optic axis of a biaxial crystal ( monoclinic) , if the refractive index of a crystal is n2>n3>n1 ?

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Silambarasan Anbumani

Dear Yuriy Pilgun, Thank you so much . . Now,I reoriented the formula. It gives value.

Dino Aquilano

When working with a biaxial crystal (triclinic, monoclinic, orthorhombic) you are dealing with two optic axes, corresponding to the two circular sections of the optical indicatrices. Formulas are useful, of course, but a simple drawing ( hand made) should be better...