Question

Explain principal section.

Answer 1

$\huge\tt{Answer:-}$

a plane passing through the optical axis of a crystal specifically : the principal plane that contains either the wave normal or the ray of light under discussion. 2 : a plane perpendicular to the edge of an optical prism.

Answer 2

Explanation:

$\huge{\red{Answer:-}}$

1. a plane passing through the optical axis of a crystal specifically : the principal plane that contains either the wave normal or the ray of light under discussion.
2. a plane perpendicular to the edge of an optical prism.