Lait a hilekchomagnetik redieshan widin a soertn puoshan a di hilekchomagnetik spekchrom. Di wod yuujali refa tu vizebl lait, we vizebl tu di yuuman yai ah rispans fi di sens a sait. Vizebl lait yuujali difain az fi ab wievlent ina di rienj a 400–700 nanomiita (nm), ar 4.00 × 10−7 tu 7.00 × 10−7 m, bitwiin di infrared (wid langga wievlent) ah di olchavailet (wid shaata wievlent). Dis wievlent miin se iab friikuensi rienj rofli bout 430–750 terahoertz (THz).