1. Ib lub qhov muag ib txwm muaj qhov deb ntawm qhov tsis kawg. Qhov ntev ntawm lub lens ntawm lub qhov muag yog 2.5 cm. Txheeb xyuas (a) qhov deb ntawm daim duab (b) lub zog ntawm lub lens.
Paub:
Qhov ntev ntawm lub lens ntawm lub qhov muag (f) = qhov deb ntawm lub cornea thiab retina = +2.5 cm ( Lub cim ntxiv qhia txog lub lens sib sau ua ke ).
Qhov nrug ntawm yam khoom ( d o ) = infinity
Xav tau : qhov deb ntawm daim duab ( d i )
Tshuaj:
(a) qhov deb ntawm daim duab
1 / f = 1/ d0 + 1/ d1
f = qhov ntev ntawm lub zeem muag , d = qhov deb ntawm yam khoom , d = qhov deb ntawm daim duab
1/ hnub = 1/ f – 1/ hnub = 1 / 2.5 – 1 / ~ = 1 / 2.5 – 0
1/ hnub = 1/ 2.5
dia = 2.5 cm = 0.025 meters
Yog tias qhov deb ntawm yam khoom yog infinity, qhov deb ntawm daim duab (d i ) = qhov ntev ntawm lub focal (f)
(b) lub zog ntawm lub lens
P = 1/f = 1/ 0.025 m = 40 Hauv cov opters
[irp]
2. Ib lub qhov muag ib txwm muaj qhov ze ntawm 25 cm. Qhov deb ntawm daim duab yog tib yam li qhov deb ntawm lub cornea thiab retina = 2.5 cm. Txheeb xyuas (a) qhov ntev ntawm lub lens (b) lub zog ntawm lub lens
Paub:
Qhov nrug ntawm yam khoom ( d o ) = 25 cm
Qhov nrug ntawm daim duab ( d i ) = 2.5 cm
Tshuaj:
(a) qhov ntev ntawm lub focal (f)
1 / f = 1/ d0 + 1/ d1
1/f = 1/ 25 + 1/ 2,5 = 1/25 + 10/25 = 11/25
f = 2.27 cm = 0.0227 m
Lub cim ntxiv qhia txog lub lens sib sau ua ke.
(b) lub zog ntawm lub lens (P)
P = 1/f = 1/ 0.0227 = 44 Hauv cov opters
3. Ib qho ntawm cov cuab yeej pom kev yog tib neeg lub qhov muag . Txheeb xyuas cov yam ntxwv ntawm cov duab uas tib neeg lub qhov muag tsim tawm ...
A. Tiag tiag, ncaj nraim
B. Tiag tiag, tig rov qab
C. Virtual, ncaj nraim
D. Virtual, tig rov qab
tshuaj
Qhov ze ntawm lub qhov muag ib txwm yog 25 cm. Qhov ze yog qhov ze tshaj plaws ntawm lub qhov muag uas ib yam khoom raug tsom mus rau ntawm retina thaum lub sijhawm puv ntoob. Lub cheeb tsam ntawm lub qhov muag tib neeg me dua 25 cm yog li qhov ntev ntawm lub lens ntawm lub qhov muag kuj me dua 25 cm. Yog li, qhov deb ntawm yam khoom (d) yuav tsum loj dua qhov ntev ntawm lub lens ntawm lub qhov muag (f).
Lub lens ntawm lub qhov muag yog lub lens convex. Yog li ntawd, daim duab uas lub lens ntawm lub qhov muag tsim muaj cov yam ntxwv zoo ib yam li daim duab uas lub lens convex tsim. Cov yam ntxwv ntawm daim duab uas lub lens ntawm lub qhov muag tsim thaum qhov deb ntawm cov khoom (s) loj dua qhov ntev focal (f):
tiag tiag, tig rov qab, me dua
Daim duab yuav tsum tsom mus rau ntawm lub retina vim tias lub retina hloov cov nthwv dej teeb mus ua cov teeb liab hluav taws xob xa mus rau lub hlwb. Txawm hais tias daim duab tig rov qab los, lub hlwb tib neeg tig nws ncaj kom cov khoom pom los ntawm lub qhov muag ncaj.
Thaum koj pom ib tsob ntoo ntawm qhov deb, tsob ntoo zoo li me dua li nws qhov loj tiag tiag. Qhov no yog raws li cov yam ntxwv ntawm daim duab uas raug txo.
Cov lus teb yog lawm yog A.
4. Lub qhov muag pom tau ib yam khoom thaum daim duab tsom mus rau ntawm lub retina qhov twg cov khoom ntawm daim duab yog ...
A. Virtual, ncaj, loj dua
B. Virtual, tig rov qab, me dua
C. Tiag tiag, tig rov qab, me dua
D. Tiag tiag, ncaj nraim, me dua
tshuaj
- Lub lens ntawm lub qhov muag yog lub lens convex, yog li ntawd, cov yam ntxwv ntawm daim duab tsim los ntawm lub lens ntawm lub qhov muag zoo ib yam li cov yam ntxwv ntawm daim duab tsim los ntawm lub lens convex.
– Qhov ze ntawm lub qhov muag ib txwm lossis qhov deb tshaj plaws uas tseem pom tau meej los ntawm lub qhov muag yog 25 cm. Lub qhov muag me me heev uas lub vojvoog ntawm qhov nkhaus thiab qhov ntev ntawm lub lens qhov muag me dua 25 cm. Yog li nws tuaj yeem xaus lus tias qhov deb ntawm cov khoom loj dua qhov ntev ntawm lub qhov muag.
- Yog tias qhov deb ntawm yam khoom loj dua qhov ntev ntawm lub zeem muag ces cov yam ntxwv ntawm daim duab uas tib neeg lub qhov muag tsim ntawm retina yog qhov tseeb, tig rov qab, thiab me dua. Txawm hais tias daim duab tig rov qab, lub hlwb tig nws ncaj thaum peb pom nws.
Cov lus teb yog C.
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