Rau cov kab hluav taws xob paraxial, qhia tias qhov ntev ntawm lub iav kheej kheej yog ib nrab ntawm nws lub vojvoog ntawm curvature… yog hu ua daim iav concave thiab yog tias sab nraud ntawm daim iav kheej kheej yog qhov cuam tshuam, nws hu ua daim iav convex.
Paraxial focal length yog dab tsi?
Thawj yog qhov ntev ntawm qhov focal ntev, qhov uas peb muaj an infinitely me aperture Yog li qhov no sib npaug rau Gaussian focal length. Thiab nws yog ib qho tseem ceeb tshaj plaws hauv cov txheej txheem tsim lub lens. … Tab sis peb muaj cov tsom iav tsom iav uas muaj tus lej me me, zoo li f-tus naj npawb ib thiab me dua.
Cov rays twg hu ua paraxial rays?
Cov lus siv kho qhov muag zoo li qhov sib npaug ntawm lub lens yog approximations uas tsuas yog siv tau rau lub teeb rays ze rau ntawm optic axis uas approximation sinθ ≈ θ yog siv tau. Cov rays no hu ua 'paraxial rays'.
Lub focal ntev ntawm daim iav kheej kheej yog dab tsi?
Focal ntev ntawm daim iav kheej kheej yog qhov kev ncua deb ntawm tus ncej ntawm daim iav mus rau qhov pom tseeb ntawm qhov khoom. Lub vojvoog ntawm qhov curvature ntawm daim iav yog txiav txim los ntawm ob lub qauv, ib qho yog magnification formula thiab lwm yam yog focal length formula.
Dab tsi yog cov kab hluav taws xob tsis zoo?
Nonparaxial rays ntawm lub teeb (cov nyob deb ntawm qhov chaw ntawm lub lens) tsis coj ib yam li paraxial rays thaum lawv dhau los ntawm lub lens. Feem ntau, lawv tsis sib tshuam (tsim) ntawm tib lub ntsiab lus tom qab lub lens.
