Pom lub teeb txhais
Lub teeb pom kev pom yog ib feem ntawm cov xim xoos hluav taws xob uas tib neeg lub qhov muag pom tau, thiab lub teeb pom kev pom tsis muaj qhov tshwj xeeb; cov kab hluav taws xob hluav taws xob tsis tuaj yeem pom tau los ntawm qhov nruab nrab ntawm tib neeg lub qhov muag yog nruab nrab ntawm 400 thiab 760 nm, tab sis qee cov neeg tuaj yeem pom tau lub wavelengths ntawm 380 thiab 780 nm. Nruab nrab ntawm electromagnetic tsis.