D. Phti thude ca ba yéu td neu tren.
MAT CAC DUNG CU QUANG
30.6. Cd hf hai thdu kfnh ghep đng true
Ll va L2. Mdt tia sang song song vdi trtic ehfnh truydn qua thdu kfnh nhu Hinh 30.2. Cd thd kdt luan nhflng gi vd hf nay ? i-2 £-1 y 1 Ol J 02 l Hinh 30.2
Ạ Ll va L2 đu la thdu kfnh hdi tụ B. Ll va L2 đu la thdu kfnh phan kị
C. Ll la thdu kfnh hdi tu, L2 la thdu kfnh phan kị D. LJ la thdu kfnh phan ki, L2 la thdu kfnh hdi tụ
30.7. Tidp cau hdi 30.6, tim kdt luan sai vd hf ghep naỵ
ẠF;^F2. B . O I 0 2 = / 2 - / I -
C. / / keo dai eat true chfnh tai F2. D. 0102 = /i + fi-
30.8. Cho mdt hf gdm hai thdu kfnh Li vd L2 đng truẹ Cdc tieu cu ldn lugt la :
/i = 20 cm ;/2 = -10 cm. Khoang each gifla hai quang tam OiO2 = a = 30 em. vat phang nhd AB dat tren true ehfnh, vudng gdc vdi trtae chfnh va d
trudc LJ, cdch Li la 20 em.
a) Xde dinh anh sau cflng eua vat, ve anh.
b) Tim vi trf phai dat vat vd vi trf cua anh sau cflng bidt rang anh nay la do va bdng hai ldn vat.
30.9. Cho hf quang hgc nhu ffinh 30.3 :
fl = 30 cm ;/2 = -10 cm ; O1O2 - '^• a) Cho AOx = 36 cm, hay :
- Xac dinh anh eudi cflng ÁB' ciia AB tao
bdi hf vdi a = 70 cm. Hinh 30.3
- Tim gid tri cua a đ ÁB' la anh that.
b) Vdi gia tri nao cua a thi sd phdng dai anh cudi cflng ÁB' tao bdi hf
thdu kfnh khdng phu thude vdo vi trf cua vat ?
B
t
^1 A A
Bai 31. MAT
31.1. Ghep mdi ndi dung d cdt ben trai vdi ndi dung tudng flng d cdt ben phaị 1. Vi chiét sudt eua thuy dich va
thd thuy tinh chenh Ifch ft 2. Didu tidt la hoat đng thay đi
tieu eti eua mdt thiic hifn 3. Khi mdt qudn sdt vat d didm
cue vidn
4. Nang sudt phan li eua mdt la gde trdng vat nhd nhdt
a) nhd cac co vdng eua mdt bdp lai lam giam bdn kfnh cong eua thd thuy tinh.
b) thi mdt d trang thdi khdng didu tiét flng vdi tieu cu ldn nhdt cua thd thuy tinh.
e) nen su khue xa dnh sang xay ra phdn ldm d mat phan each khdng khf - gidc mac.
d) ma mdt cdn phan bif t hai diem đu vd eudi cua vat.
e) d trang thai didu tidt tdi da flng vdi tieu eti nhd nhdt cua thd thuy tinh.
31.2. Tuomg tti bdi 31.1.
Dat: O la quang tam mdt; C^ la didm cue vidn ;
V la didm vdng ; C^ la didm ctic can.
1. Dae trung edu tao eua mdt can la : d) - OC .
2. Dae trung edu tao eua mdt vidn la : h) f < OV
3. Khi khdc phtic tat can thi bang each deo kfnh sat mdt thi tieu eu eua kfnh ed gid tri:
> 4. Mat khdng tat lue didu tiét tdi da thi cd đ d) tu tang ien mdt lugng ed gia tri tfnh bdi:
e) OC^ >d> OC^. 31.3. Khi mdt khdng didu tidt thi anh efla didm cue can C^ dugc tao ra d dau ?
Ạ Tai didm vang V. B. Trudc didm vang V.
C. Sau didm vdng V. D. Khdng xae dinh duge vi khdng ed anh.
31.4. Khi mdt didu tiet tdi da thi anh eua didm cue vidn C^ dugc tao ra tai dau ? Ạ Tai didm vdng V. B. Trudc didm vdng V.
C. Sau didm vang V. D. Khdng xde dinh duge vi khdng cd anh.
^) /max 1
OC^
31.5. Dat do tu cua cac loai mat nhu sau d trang thai khdng didu tiét:
DJ : Mat binh thudng (khdng tat) ; D2 : Mat can ; D3 : Mdt vidn.
Coi nhu khoang cdch tfl thd thuy tinh đn vong mac la nhu nhaụ So sanh cdc đ tu nay ta cd kdt qua nao ?
ẠDi>D2>£>3. B . D 2 > D i > D 3 .
C.D.>D, >Dn D. Mdt kdt qua khdc A, B, C.
• Xet mpt mat can dugc md ta 6 Hinh 31.1. Dung cac gia thi^t da cho de chpn dap an dung 6 cac cau hoi tfl 31.6 den 31.9.
(00)
{oc,<^)
Hinh 31.1
31.6. vat CO vi trf tai dau thi anh tao bdi mat hifn ra d didm vang V ?
Ạ Tai Cy khi mdt didu tidt td'i dạ
B. Tai Cc khi mdt khdng didu tidt.
C. Tai mdt didm trong khoang C^Cf. khi mdt didu tidt thfch hop.
D. Mdt vi trf khdc vdi A, B, C.
31.7. Dd cd thd nhin rd edc vat d vd cue ma khdng didu tidt, thi kfnh phai deo sat mdt la kfnh phan ki cd đ ldn cua tieu cu la :
Ạ I/I = 0C^. B. 1/1 = OC^.
C. 1/1 = C^C^. D.\f\ = OV.
31.8. Khi deo kfnh đ dat yeu edu nhu d eau 31.7 thi didm gdn nhdt ma mdt nhin thdy Id didm ndo ?
Ạ van la didm C^.
B. Mdt didm d trong doan OC^. C. Mdt didm d trong doan C^Cỵ