EntityQ632617· pop 6· linked from 19 articlesvergenceSign in to savereciprocal of the distance between the point of focus and a reference planeConnectionsrayEntitycardinal pointEntityInternational Standard Book NumberEntitytelescopeEntityopticsEntitylaserEntitywavelengthEntitylensEntityradianEntitydiffractionEntityparallelismEntityfocal lengthEntitydioptreEntityfocusEntitygeometrical opticsEntitycurvatureEntityphysical opticsEntitylaser cuttingEntitywavefrontEntitylaser diodeEntityCategoriesGeometrical optics