1. Muab ib yam khoom siab 2 hli tso rau ntawm lub iav tsom iav 10 cm . Nyob ze ntawm qhov chaw N = 25 cm. Txheeb xyuas qhov loj ntawm lub kaum sab xis thiab qhov siab ntawm daim duab.
Paub:
Qhov siab ntawm yam khoom (h₂o ) = 2 hli
Qhov ze (N) = 25 cm
Qhov nrug ntawm yam khoom (d o ) = 10 cm
Xav tau: Angular magnification (M) thiab daim duab siab (h i )
Tshuaj:
M = N / s
M = 25 cm / 10 cm
M = 2.5
Qhov siab ntawm daim duab = 2.5 x 2 hli = 5 hli.
2. Siv lub lens uas ntev li ntawm 25 cm los ua lub tsom iav. Txheeb xyuas (a) qhov loj ntawm lub kaum sab xis thaum lub qhov muag tsom mus rau nws qhov ze N = 25 cm (b) qhov loj ntawm lub kaum sab xis thaum lub qhov muag so.
Paub:
Qhov ze (N) = 25 cm
Qhov ntev ntawm lub iav tsom iav (f) = 25 cm
Lub cim ntxiv qhia tias lub lens yog lub lens sib sau ua ke.
Tshuaj:
(a) lub kaum sab xis loj thaum lub qhov muag tsom mus rau nws qhov ze N = 25 cm
M = (N/f) + 1
M = (25 cm / 25 cm) + 1
M = 1 + 1
M = 2 X
Yog tias qhov siab ntawm yam khoom yog 1 cm, qhov siab ntawm daim duab yog 2 x 1 cm = 2 cm.
(b) lub kaum sab xis loj thaum lub qhov muag so
M = N / f
M = (25 cm / 25 cm)
M = 1 X
Yog tias qhov siab ntawm yam khoom yog 1 cm, qhov siab ntawm daim duab yog 1 x 1 cm = 1 cm.
3. Muab ib yam khoom siab 1 cm tso rau ntawm xub ntiag ntawm lub lens uas muaj qhov ntev focal length 10 cm. Txheeb xyuas (a) qhov siab ntawm daim duab thaum lub qhov muag tsom mus rau ntawm nws qhov ze N = 25 cm (b) Qhov siab ntawm daim duab thaum lub qhov muag so.
Paub:
Qhov siab ntawm yam khoom (h₂o ) = 1 cm
Qhov ntev ntawm lub teeb (f) = 10 cm
Qhov ze (N) = 25 cm
Tshuaj:
(a) Qhov siab ntawm daim duab thaum lub qhov muag tsom mus rau nws qhov ze N = 25 cm
M = (N/f) + 1
M = (25 cm / 10 cm) + 1
M = 2.5 + 1
M = 3.5 X
Yog tias qhov siab ntawm yam khoom yog 1 cm, qhov siab ntawm daim duab yog 3.5 x 1 cm = 3.5 cm.
(b) Qhov siab ntawm daim duab thaum lub qhov muag so.
M = N/f
M = 25 cm / 10 cm
M = 2.5 X
Yog tias qhov siab ntawm yam khoom yog 1 cm, qhov siab ntawm daim duab yog 2.5 x 1 cm = 2.5 cm.
4. Lub kaum sab xis loj thaum lub qhov muag so = 5X. Yog tias qhov ze ze = 25 cm, qhov ntev ntawm lub iav tsom iav yog dab tsi?
Paub:
Qhov siab ntawm yam khoom (h₂o ) = 2 hli
Lub kaum sab xis loj (M) = 5X
Qhov ze (N) = 25 cm
Xav tau: Qhov ntev ntawm lub focal
Tshuaj:
Cov mis ntawm lub kaum sab xis loj thaum lub qhov muag so:
M = N/f
5 = 25 cm / f
f = 25 cm / 5
f = 5 cm
Qhov ntev ntawm lub iav tsom iav = 5 cm.
5. Ib tug neeg pom ib yam khoom nrog lub iav tsom iav uas ntev li 15 cm. Yog tias qhov ze ntawm tus neeg lub qhov muag = 30 cm, ces txiav txim siab seb lub iav tsom iav loj npaum li cas.
Paub:
Qhov ze ntawm lub qhov muag ib txwm (N) = 30 cm
Qhov ntev ntawm lub iav tsom iav (f) = 15 cm (ntxiv rau lub cim vim tias lub iav sib sau ua ke)
Xav tau: qhov loj tshaj plaws
Tshuaj:
Qhov kev loj hlob siab tshaj plaws tshwm sim thaum qhov chaw nyob ntawm lub qhov muag siab tshaj plaws. Qhov kev loj hlob ntawm lub iav tsom iav tshwm sim thaum qhov chaw nyob ntawm lub qhov muag siab tshaj plaws:
M = (N/f) + 1
M = (30 cm / 15 cm) + 1
M = 2 + 1
M = 3 zaug
6. Ib lub iav tsom iav uas muaj lub zog pom kev zoo li 20 diopters uas ib tus neeg uas muaj qhov muag zoo li qub siv 25 cm. Yog tias qhov kev pab tsawg kawg nkaus, txiav txim siab qhov kev loj hlob tsawg kawg nkaus.
Paub:
Ze ntawm qhov muag ib txwm (N) = 25 cm
Lub zog ntawm lub iav tsom iav (P) = 20 diopters
Xav tau: Qhov tsawg kawg nkaus magnification
Tshuaj:
Qhov ntev ntawm lub iav tsom iav:
P = 1/f
20 = 1/f
f = 1/20
f = 0.05 meters
f = 5 cm
Lub angular magnification thaum qhov chaw nyob tsawg kawg nkaus:
M = N / f
M = (25 cm / 5 cm)
M = 5 zaug
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