EntityQ4165224· pop 9· linked from 39 articlesslow lightSign in to savepropagation of an optical pulse at a very low group velocityConnectionsrefractive indexEntitycolorEntitylightEntityelectronEntityInternational Standard Book NumberEntityHarvard UniversityEntityspeed of light in vacuumEntityvacuumEntityopticsEntityspecial relativityEntitysemiconductorEntityIBMEntityThe GuardianEntitydigital object identifierEntityTerry PratchettEntityInternational Standard Serial NumberEntityderivativeEntityintegrated circuitEntityrefractionEntityMaxwell's equationsEntityCategoriesLightNonlinear optics