Optical Extinction in Minerals

Illustrates the concept of anisotropic minerals and how they "go extinct" (dark) once for every 90 degree turn of the stage (by Keith Putirka)

[@phoebefang6327]

Very clear and helpful explanations. Thanks so much:)

[@0nomercy0]

Ho, thanks for the explanation! Just a question: why does extinction occur every 90 degrees? Or, what happen to a polarized light ray passing trought the perpendicular direction to the optical axis? Thanks!

[@anirbanguha8579]

That's my doubt also