What type of crystals did Fresnel study in relation to light refraction?
Quartz
Calcite
Diamond
Sapphire
Answer
Fresnel studied calcite crystals in relation to light refraction. He generalized the direction-speed-polarization relation for calcite, which helped him account for the directions and polarizations of refracted rays in doubly-refractive crystals of the biaxial class.
Shedding Light on Augustin-Jean Fresnel: The Brilliant Mind Behind Modern Optics