Raws li cov qauv kev lag luam, kev tsim khoom thiab kev sim cov iav txheej feem ntau ua raws li cov qauv kho qhov muag thiab cov khoom siv science.
Piv txwv li, daim iav transmittance, reflectance, thiab xim sib txawv yuav tsum ua tau raws li cov kev cai tshwj xeeb los xyuas kom meej qhov sib xws thiab ruaj khov ntawm nws qhov pom kev.
Lub caij no, daim iav kev nyab xeeb thiab kev phooj ywg ib puag ncig kuj tseem ceeb heev rau kev txiav txim siab, xws li seb nws puas muaj cov tshuaj phem thiab seb nws puas yooj yim los ntxuav thiab tswj.
Nws yog ib qho tsim nyog sau cia tias cov iav txheej txheej yog qhov ua tau zoo heev; tsis xws li daim iav qhov loj me, cov duab, thiab cov nyhuv reflective tuaj yeem hloov kho raws li cov kev xav tau tshwj xeeb. Yog li ntawd, thaum xaiv cov iav txheej, nws raug nquahu kom sib txuas lus nrog cov kws tshaj lij lossis cov neeg muag khoom kom paub meej cov kev xav tau thiab tau txais cov kev daws teeb meem tsim nyog.