什么情况下非常光线和入射光线位于晶面法线同侧

On what conditon etraordinary light and incident light lies to the same side of normal of crystal surface

本文讨论了非常光线和入射光线位于晶面法线同侧的条件，并指出某些文献中的不正确之处。

This paper discusses the conditon on which extraordinary light and Incident light lies to the same side of normal of crystal surface and points out uncertain in some documents．