EntityQ958131· pop 8· linked from 47 articlesPolaroidSign in to saveoptically active materialConnectionselectronEntityiodineEntityplasticEntitymicroscopeEntitycrystalEntityelectric fieldEntitypolymerEntityliquid-crystal displayEntitypolystyreneEntitysunglassesEntitynitrocelluloseEntitypolycarbonateEntityPolaroid CorporationCompanyinstant cameraEntityEdwin H. LandEntitypolarizerEntityHarvard University PressEntityWileyEntitypolyvinyl alcoholEntitydichroismEntityCategoriesBrand name materialsOptical materialsPolarization (waves)Products introduced in 1929