Dispersion yog ib qho tshwm sim nyob rau hauv uas lub teeb polychromatic yog decomposed rau hauv monochromatic teeb los tsim ib spectrum. Dispersion tuaj yeem ua tiav los ntawm kev siv cov cuab yeej xws li prisms lossis gratings uas ua raws li cov tshuab dispersive. Piv txwv li, tom qab lub teeb polychromatic nkag mus rau hauv lub prism, vim hais tias nws muaj qhov sib txawv refractive indices rau lub teeb ntawm ntau zaus, cov lus qhia kev nthuav tawm ntawm ntau lub teeb xim muaj qhov sib txawv ntawm deflection, yog li thaum lawv tawm ntawm lub prism, lawv tau tawg mus rau hauv spectrum. .
