Magnification 1 txhais tau hais tias cov duab nyob deb yog tib yam li cov khoom nyob deb thiab qhov loj ntawm daim duab yog tib yam li cov khoom. Qhov no tshwm sim tsuas yog tias txoj hauj lwm ntawm cov khoom yog nyob ntawm 2f, i.e, focal ntev. Yog li, cov khoom yuav tsum tau muab tso rau ntawm qhov deb ntawm 24 cm (2 × 12) los ntawm lub lens converging.
Ntawm qhov deb ntawm lub lens converging yog focal ntev 12 cm?
Tus khoom yuav tsum muab tso rau ntawm qhov deb ntawm 24 cm rau ntawm lub lens (ntawm sab laug).
Nyob deb npaum li cas ib qho khoom yuav tsum muab tso rau ntawm lub lens converging?
Cov khoom yuav tsum muab tso rau ntawm qhov deb ntawm - 72 cm ntawm lub lens.
Nyob deb li cas los ntawm lub lens convex ntawm focal ntev 12 cm yuav tsum muab ib yam khoom tso kom lub lens tsim ib daim duab ntawm qhov loj me li cov khoom?
Yog li ntawd, cov khoom yuav tsum muab tso rau ntawm qhov deb ntawm 16 cm ntawm lub lens convex.
Qhov kev ncua deb yog qhov focal ntev ntawm lub lens?
Lub focal ntev ntawm lub lens yog qhov kev ncua deb ntawm lub lens thiab cov duab sensor thaum lub ntsiab lus tseem ceeb, feem ntau teev hauv millimeters (piv txwv li, 28 mm, 50 mm., los yog 100 mm). Nyob rau hauv cov ntaub ntawv ntawm zoom lo ntsiab muag, ob qhov tsawg kawg nkaus thiab siab tshaj plaws focal lengths tau teev, piv txwv li 18–55 mm.
