noun
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
noun
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
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012