Rays ntawm lub teeb thaum uas tig mus rau lub hauv paus axis ntawm daim iav concave yuav tshwm sim los sib sau ua ke ntawm ib qho taw qhia ntawm daim iav qhov chaw ntawm daim iav ncej thiab nws qhov chaw ntawm curvature. Qhov no ua rau qhov no yog daim iav converging thiab lub ntsiab lus uas cov rays converge yog hu ua lub focal point los yog tsom.
Puas yog lub ntsiab lus ntawm daim iav concave zoo lossis tsis zoo?
Lub focal ntev f ntawm daim iav concave yog qhov zoo, vim nws yog daim iav converging. Daim duab 2. (a) Parallel rays reflected from a large spherical mirror do not all crossed at a common point. (b) Yog tias daim iav kheej kheej me me piv nrog nws lub vojvoog ntawm curvature, cov kab hluav taws xob sib txuas tau tsom mus rau qhov sib txawv.
Puas tsom ntawm daim iav concave ib txwm tsis zoo?
Qhov tsom ntawm daim iav concave yog nyob rau hauv pem hauv ntej ntawm daim iav ntawm sab laug, yog li focal ntev ntawm daim iav concave yuav tsis zoo (thiab sau nrog kos npe rho tawm, hais, -10 cm).
Yuav ua li cas koj pom qhov tsom ntawm daim iav concave?
Los ntawm kev tau txais cov duab tiag ntawm ib qho khoom nyob deb ntawm nws qhov kev tsom, qhov ntev ntawm lub iav concave tuaj yeem kwv yees raws li qhia hauv daim duab. Lub focal ntev ntawm daim iav convex yog qhov zoo, whereas ntawm daim iav concave yog qhov tsis zoo. Tib yam kuj tuaj yeem ua pov thawj los ntawm kev siv daim iav mis: (1/f=1/v +1/u).
Puas yog qhov tsom ntawm daim iav concave tiag tiag lossis virtual?
Daim iav concave reflecting nto yog khoovsab hauv kom pom tseeb, piv txwv li, deb ntawm lub teeb ci. Thaum lub nkhaus bounces lub teeb mus rau ib qho chaw, lawv tsim ib daim duab. Nws muaj tseeb tias daim iav convex muaj qhov tsom xam virtual lossis daim iav concave muaj qhov tseeb tiag.
