focal tob ntawm microscope
Qhov tob ntawm kev ua kom pom tseeb yog cov ntawv luv ntawm qhov tob ntawm kev tsom xam, uas yog, thaum siv lub tshuab ntsuas, thaum lub tsom xam yog nyob rau ntawm ib qho khoom, tsis yog cov ntsiab lus ntawm lub dav hlau ntawm qhov taw tes tuaj yeem pom meej, tab sis kuj nyob rau hauv ib qho thickness. saum toj thiab hauv qab lub dav hlau. Kom meej meej, lub thickness ntawm qhov tseeb qhov no yog qhov tob ntawm kev tsom xam. Thaum qhov tob ntawm kev tsom xam loj, tag nrho cov txheej ntawm cov khoom yuav raug tshuaj xyuas tuaj yeem pom, thaum qhov tob ntawm kev tsom xam me me, tsuas yog ib txheej nyias ntawm cov khoom yuav tsum tau kuaj pom. Qhov tob ntawm kev tsom xam muaj cov hauv qab no kev sib raug zoo nrog rau lwm yam technical parameters:
(1) Qhov tob ntawm kev tsom xam yog inversely proportional rau tag nrho magnification thiab tus lej aperture ntawm lub hom phiaj.
(2) Qhov tob ntawm kev tsom xam yog qhov loj thiab qhov kev daws teeb meem raug txo.
Vim qhov loj qhov tob ntawm daim teb ntawm lub hom phiaj qis magnification, nws yog ib qho nyuaj rau kev thaij duab nrog lub hom phiaj qis magnification.
