Waxaa si ballaaran loogu isticmaalaa meelaha sida calaamadaynta laysarka, qodista, xaraashka, alxanka, jarista, daawaynta dusha sare, iwm. Xuduudaha gaarka ah ee badeecadan oo leh qaboojinta biyaha waa sida soo socota. Muraayadda goobta waxay diiradda saartaa laysarka isku-dhafka ah hal dhibic, iyadoo kordhinaysa cufnaanta tamarta ee iftiinka laysarka. Waxay isticmaashaa tamarta sare ee laysarka si ay u qabato hawlo kala duwan oo walxo ah sida jarista, calaamadaynta, alxanka, nadiifinta, iyo daaweynta dusha sare. Isla mar ahaantaana, marka jihada iftiinka laysarka ee dhacdada ay isbeddesho, muraayadda goobta ayaa wali ilaalin karta meel iftiin leh oo leh cabbir qaraabo ah iyo cufnaanta tamarta oo aan isbeddelin, taasoo u oggolaanaysa iftiinka laysarka inuu ka shaqeeyo meelaha kala duwan ee walxaha. Iyadoo la isku darayo muraayadda goobta iyo galvanometer kaas oo si dhakhso ah oo sax ah u beddeli kara jihada iftiinka laysarka ee dhanka bari, waxaa la gaari karaa farsamaynta xawaaraha sare iyo saxda ah iyo farsamaynta agabka.
Wavelength waxay diiradda saareysay bixinta alaabada indhaha ee saxsan ee sare muddo 20 sano ah