"0"^^ . "birefringence"@en-us . . "splitting a ray into two parallel rays polarized perpendicularly"@en-us . "0"^^ . . . . "double refraction"@en-us . . "111503482"^^ . . . . "110761437"@en-us . . "11503482-n"^^ . "double refraction"^^ . . .