D. Phti thude ca ba yéu td neu tren.
MAT CAC DUNG CU QUANG
33.8. Kfnh hidn vi ed vat kfnh Lj tifu eu/ i= 0,8 cm va thi kfnh L2 tieu cu/2 =2 em.
Khoang each gifla hai kfnh la / = 16 em.
a) Kfnh dugc ngdm chiing d vd ctic. Tfnh khoang each tfl vat đn vat kfnh vd sd bdi gidc.
Bidt ngudi quan sdt ed mdt binh thudng vdi khoang cue can la OC^ = 25 cm.
b) Gifl nguyen vi trf vat va vat kfnh, ta dich thi kfnh mdt khoang nhd đ thu dugc anh cua vat tren man dat cdch thi kfnh 30 em.
Tfnh đ dich chuydn cua thi kfnh, xde dinh chidu dich ehuydn. Tfnh sd phdng dai anh.
Bdi 34. KINH THIEN VAN
34.1. Ghep mdi ndi dung d edt ben trdi vdi ndi dung tuong flng d edt ben phaị vat kfnh cua kfnh thien van la
Khi didu chinh kfnh thien van ta ehi cdn
Khi ngdm chting kfnh thien van d vd ctic thi
Sd bdi giac eua kfnh thien van ngdm chiing d vd cue
1. vat kfnh cua kfnh thien van la a) xe dich thi kfnh đ anh sau 2. Khi didu chinh kfnh thien van cflng hifn ra trong khoang nhin
rd cua mdt.
b) sd bdi giac cua kfnh khdng phu thude vi tri cua mdt dat sau thi kfnh.
e) mdt thdu kfnh hdi tti ed tieu cu rdt ldm (cd thd tdi hang chtic met). d) ti If thuan vdi tieu cu cua vat
kfnh vd ti If nghich vdi tieu eti cua thi kfnh.
e) la kfnh lup cd tieu eti nhd (vai xentimet).
34.2. Chgn tra ldi dung vd cd đ ldn cua tieu cu va đ tu cua vat kfnh, thi kfnh đi vdi kfnh hidn vi va kfnh thien van neu trong bang dudi daỵ
Kfnh hidn vi vat kfnh Ạ xentimet B. milimet C. xentimet D. milimet Thi kfnh milimet xentimet xentimet met Kfnh thien van v a t kfnh tram didp < 1 didp ehtic didp didp Thi kfnh chuc didp chuc didp tram didp tram didp
giac Ạ / C. / : Goo = / i = / i 7 -fl + fl' ; Goo ; Gaa fl fl fl fx Goo Goo _ / 2 / l _ / l fl
34.3. Khi mdt ngudi cd mat khdng bi tat quan sat kfnh thien van d trang thai khdng didu tiét thi ed thd kdt luan gi vd đ dai / cua kfnh va sd bdi
B. / = / , - / 2
D. / = /, + /2
34.4. Mdt ngudi cd khoang ctic can D quan sat anh cua mdt thien thd bdng each
ngdm ehiing d cue can. Sd bdi gidc cua kfnh cd bidu thflc nao (mdt sdt thi kfnh)?
A . A B . - ^ . C. ^ . D.KhaeA,B,C.
Jl Jl '^ fl ^
34.5. Kfnh thien van khue xa Y-ec-xd (Yerkes) ed tieu eti vait kfnh Id 19,8 m. Mat Trang cd gdc trdng tfl Trai Ddt la 33'. Anh cua Mat Trang tao bdi vat kfnh cua kfnh thien van ndy ed đ ldm (tfnh trdn) la bao nhieu ?
Ạ 19 em. B. 53 em. C. 60 cm. D. Mdt tri sd khdc A, B, C.
34.6. Di lam giam chidu dai cua kfnh vd đng thdi tao anh thuan chidu, kfnh
thien van dugc bién đi bdng cdch dung thdu kfnh phan ki ldm thi kfnh. Kfnh duge dflng lam dng nhdm,... Cho bidt vat d vd cue vd anh cung dugc tao ra d vd cuẹ Ve dudng truydn cua chum tia sang.
34.7. Vat kfnh eua kfnh thien van la mdt thdu kfnh hdi tti Lj cd tieu cu Idn ; thi kfnh Id mdt thdu kfnh hdi tu L2 cd tieu cu nhd.
a) Mdt ngudi mdt khdng ed tat, dflng kfnh thien van nay đ quan sat Mat Trang d trang thai khdng didu tidt. Khi đ khoang each gifla vat kfnh va thi kfnh la 90 cm. Sd bdi gidc eua anh la 17. Tfnh eae tieu eu cua vat kfnh va thi kfnh.
b) Gde trdng cua Mat Trang tfl Trdi Ddt la 33' (1' = 1/3500 rad). Tfnh dudng kfnh anh cua Mat Trang tao bdi vat kfnh vd gdc trdng anh cua Mat Trang qua thi kfnh.
c) Mdt ngudi can thi ed didm cue vidn C^ each mdt 50 cm, khdng deo
kfnh can, quan sdt Mat Trang qua kfnh thien van ndi tren. Mdt dat sat thi kinh. Ngudi nay phai dich ehuydn thi kfnh nhu thd nao đ khi quan sat mdt khdng phai didu tidt ?