Question

Rays which are nearly parallel to the optic axis are known as ​

Answer 1

Explanation:

polarisation parallel is a correct answer

Answer 2

Answer:

Comparison of positive and negative birefringence. In negative birefringence (1), the polarisation parallel (p) to the optic axis A is the fast ray (F) while the perpendicular polarisation (s) is the slow ray (S). In positive birefringence (2), it is the reverse.