Ua ntej yuav tau cov mis rau lub lens concave, xub nkag siab ntau txoj cai rau cov cim ntawm lub lens concave.
Txoj Cai Kos Npe Lens Concave
- Qhov nrug ntawm yam khoom (s)
Yog tias qhov khoom nyob rau tib sab ntawm lub lens raws li qhov kev taw qhia ntawm lub teeb ci ntsa iab los ntawm ces qhov deb ntawm yam khoom cim tias zoo.
- Duab nrug (s')
Yog tias lub teeb ci ntsa iab hla dhau qhov ntxoov ntxoo ces qhov deb ntawm duab ntxoov ntxoo yog cim zoo (duab tiag tiag). Yog tias daim duab tsis dhau los ntawm lub teeb ces qhov deb ntawm duab ntxoov ntxoo lub cim tsis zoo (duab virtual).
- Qhov ntev ntawm lub zeem muag (f)
Thaum lub lens tig mus rau sab nraud ntawm lub teeb, qhov ntawd qhov ntev ntawm qhov muag Lub lens yog cim zoo. Ntawm qhov tod tes, yog tias qhov chaw tseem ceeb ntawm lub lens tsis dhau los ntawm lub teeb ci, ces qhov ntev ntawm qhov muag Lub lens yog cim tsis zoo. Lub ntsiab lus ntawm lub lens concave tsis dhau los ntawm lub teeb vim qhov no qhov ntev ntawm qhov muag cov iav concave yog negative.
- Qhov siab ntawm yam khoom (h)
Yog tias tus khoom nyob saum toj ntawm lub axis ntawm lub lens concave ces qhov siab ntawm yam khoom lub cim zoo (khoom ncaj). Ntawm qhov tod tes, yog tias lub khoom nyob hauv qab lub axis ntawm lub lens concave ces qhov siab ntawm yam khoom lub cim tsis zoo (khoom tig rov qab).
- Qhov siab ntawm qhov ntxoov ntxoo (h')
Yog tias daim duab nyob saum toj ntawm lub axis ntawm lub lens concave ces qhov siab ntawm qhov ntxoov ntxoo lub cim zoo (duab ncaj). Yog tias daim duab nyob hauv qab lub axis ntawm lub lens concave ces qhov siab ntawm qhov ntxoov ntxoo lub cim tsis zoo (duab tig rov qab).
- Kev loj ntawm daim duab (m)
Yog tias daim duab loj dua 1 ces qhov loj ntawm daim duab loj dua qhov loj ntawm yam khoom. Yog tias qhov loj ntawm daim duab = 1 ces qhov loj ntawm daim duab zoo ib yam li qhov loj ntawm yam khoom. Yog tias qhov loj ntawm daim duab < 1 ces qhov loj ntawm daim duab me dua qhov loj ntawm yam khoom.
Cov Qauv Lens Concave
Saib daim duab hauv qab no. Muaj ob lub teeb uas pom mus rau lub lens concave, tom qab ntawd cov teeb raug refracted los ntawm lub lens concave.
Cov Lus Piav Qhia:
s = qhov deb ntawm yam khoom, s' = qhov deb ntawm daim duab, h = P P' = qhov siab ntawm yam khoom, h' = Q Q' = qhov siab ntawm daim duab, F1 thiab F2 = qhov chaw tseem ceeb ntawm lub lens concave.
Hauv lub teeb P'AS, daim duab peb ceg P'AP zoo ib yam li daim duab peb ceg Q'AQ. Yog li:
Hauv lub teeb P'BR, daim duab peb sab BF2A zoo ib yam li daim duab peb ceg Q'F2Q qhov twg qhov deb AB = qhov siab ntawm yam khoom (h) thiab qhov deb F2A = qhov ntev ntawm lub lens concave (f) ntawm lub lens concave. Yog li:
Cov sab laug thiab sab xis ntawm cov qauv 1 thiab 2 yog sib npaug, yog li ntawd cov sab xis yog sib npaug:
Muab ob sab ntawm qhov sib npaug sib npaug los ntawm s':
Raws li cov cai ntawm lub cim lens concave, cov mis no tuaj yeem hloov pauv kom ua raws li hauv qab no: daim iav nkhausYog tias duab nrug (s') tau muab ib lub cim tsis zoo vim tias lub teeb tsis hla dhau lub duab ntxoov ntxoo thiab qhov ntev ntawm qhov muag (f) kuj tau muab ib lub cim tsis zoo vim tias qhov chaw tseem ceeb ntawm lub lens concave tsis dhau los ntawm lub teeb (piv nrog rau daim duab ntawm kev tsim cov duab saum toj no). Raws li cov lus no, cov mis rau lub lens concave saum toj no hloov mus rau:
Kev piav qhia: s = qhov deb ntawm yam khoom, s' = qhov deb ntawm daim duab, f = qhov ntev ntawm lub zeem muag.
Nco ntsoov nco ntsoov txoj cai kos npe ntawm lub lens concave thaum siv cov mis no los daws cov teeb meem lens concave.
Kev Loj Hlob Duab (m)
Saib daim duab ntawm qhov tsim ntawm tus duab ntxoov ntxoo ntawm yam khoom saum toj no. Cov duab peb ceg P'AP thiab Q'AQ zoo sib xws, yog li peb tuaj yeem tau txais kev sib raug zoo ntawm qhov deb ntawm yam khoom thiab qhov deb ntawm tus duab ntxoov ntxoo nrog qhov siab ntawm yam khoom thiab qhov siab ntawm tus duab ntxoov ntxoo:
Cov mis no sau dua raws li hauv qab no los ntawm kev ntxiv m:
Cov Ntaub Ntawv:
m = kev loj ntawm daim duab
h = qhov siab ntawm yam khoom (zoo yog tias nws nyob saum lub axis ntawm lub lens concave lossis yam khoom ncaj)
h' = qhov siab ntawm daim duab (zoo yog tias nws nyob saum toj ntawm lub lens concave lossis daim duab sawv ntsug)
s = qhov deb ntawm yam khoom (zoo yog tias yam khoom ntawd dhau mus lub teeb ci ntsa iab tuaj)
s' = qhov deb ntawm daim duab (zoo yog tias daim duab raug hla dhau) lub teeb ci los yog daim duab tiag tiag)
Cov Lus Nug Piv Txwv Txog Concave Lens
Kawm piv txwv ntawm lub lens concave yog li koj thiaj li nkag siab zoo dua yuav ua li cas siv cov mis lens concave.
Cov Lus Nug Txog Kev Xyaum Siv Concave Lens
Ua nws Cov lus nug txog kev xyaum siv lub lens concave yog li koj thiaj li txawj ntse dua ntawm kev daws teeb meem lens concave.
