Virtual vs Real Images
Cov duab virtual thiab cov duab tiag yog ob hom duab uas pom tseeb kev tsim tawm ntawm cov khoom tiag tiag tsim los ntawm daim iav lossis lub lens. Cov duab no yog tsim los ntawm cov txheej txheem ntawm kev xav, refraction lossis diffraction rays ntawm lub teeb. Hauv daim duab tiag tiag, lub teeb rays raug coj los ua kom pom tseeb ntawm qhov chaw ntawm daim duab. Qhov tseem ceeb tshaj plaws ntawm cov duab yog tias cov duab tiag tuaj yeem ua rau pom ntawm lub vijtsam xws li daim ntawv ntawm daim ntawv thaum daim duab virtual tsis tuaj yeem tsim tawm ntawm lub vijtsam. Qee qhov piv txwv ntawm cov duab tiag tiag yog cov uas ua los ntawm lub koob yees duab lens ntawm zaj duab xis lossis cov duab ua los ntawm lub lens projector ntawm qhov screen ntawm lub tsev xinesmas. Muaj qee qhov sib txawv ntawm qhov tiag thiab cov duab virtual uas yuav tau tham hauv kab lus no.
dluab virtual yog tsim los ntawm rays uas tsis tau los ntawm qhov twg ib tug pom daim duab. Piv txwv li, nyob rau hauv cov ntaub ntawv ntawm ib tug duab tsim los ntawm ib tug dav hlau daim iav nws yog nyob rau ntawm ib tug deb tom qab daim iav thiab tsis nyob qhov twg nws zoo li tus saib. Qhov no yog vim li cas nws thiaj li hu ua daim duab virtual.
Hais lus ntawm lo ntsiab muag, ib daim duab tiag yog tsim thaum lub teeb rays los ntawm ib qho taw tes ntawm ib sab ntawm lub lens yog refracted los ntawm lub lens kom lawv tsom mus rau ib qho taw tes ntawm lwm sab ntawm lub lens ntawm qhov chaw duab.. Qhov no tshwm sim thaum qhov khoom nyob ntawm qhov deb tshaj qhov focal ntev ntawm lub lens. Ntawm qhov tod tes, thaum lub teeb rays los ntawm ib sab ntawm lub lens yog refracted los ntawm lub lens kom lawv diverge rau lwm sab ntawm lub lens, ib tug virtual duab yog tsim. Kev tsim cov duab virtual muaj qhov yuav tsum tau ua kom cov khoom yuav tsum nyob deb tsawg dua qhov focal ntev ntawm lub lens.
Yuav kom pom cov duab ntawm lub vijtsam teeb pom kev zoo yuav tsum los ua kom pom tseeb ntawm qhov screen. Tab sis nyob rau hauv cov ntaub ntawv ntawm ib tug virtual duab, tsis muaj tiag tiag lub teeb rays los ua ke ntawm qhov chaw ntawm lub virtual duab uas yog vim li cas ib tug tsis pom ib tug virtual duab ntawm lub screen.
In luv:
• Thaum cov duab tiag tiag tshwm rov qab, cov duab virtual tshwm erect
• Thaum cov duab tiag tuaj yeem tau txais ntawm lub vijtsam, cov duab virtual tsis tuaj yeem pom ntawm lub vijtsam.
• Nyob rau hauv daim iav, cov duab tiag nyob rau pem hauv ntej thaum virtual duab nyob tom qab daim iav.
• Nyob rau hauv cov ntaub ntawv ntawm lo ntsiab muag, cov duab tiag nyob rau sab nraud ntawm cov khoom whereas virtual duab nyob rau tib sab ntawm cov khoom.
