{"segment":[{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"\u0110\u1eb7c \u0111i\u1ec3m n\u00e0o sau \u0111\u00e2y l\u00e0 kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi th\u1ea5u k\u00ednh ph\u00e2n k\u1ef3? ","select":["A. c\u00f3 ph\u1ea7n r\u00eca m\u1ecfng h\u01a1n \u1edf gi\u1eefa.","B. l\u00e0m b\u1eb1ng ch\u1ea5t li\u1ec7u trong su\u1ed1t.","C. c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t m\u1eb7t ph\u1eb3ng c\u00f2n m\u1eb7t kia l\u00e0 m\u1eb7t c\u1ea7u l\u00f5m.","D. c\u00f3 th\u1ec3 hai m\u1eb7t c\u1ee7a th\u1ea5u k\u00ednh \u0111\u1ec1u c\u00f3 d\u1ea1ng hai m\u1eb7t c\u1ea7u l\u00f5m."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3471},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" Tia t\u1edbi song song v\u1edbi tr\u1ee5c ch\u00ednh c\u1ee7a th\u1ea5u k\u00ednh ph\u00e2n k\u1ef3 cho tia l\u00f3 ","select":["A. \u0111i qua ti\u00eau \u0111i\u1ec3m c\u1ee7a th\u1ea5u k\u00ednh.","B. song song v\u1edbi tr\u1ee5c ch\u00ednh c\u1ee7a th\u1ea5u k\u00ednh.","C. c\u1eaft tr\u1ee5c ch\u00ednh c\u1ee7a th\u1ea5u k\u00ednh t\u1ea1i m\u1ed9t \u0111i\u1ec3m b\u1ea5t k\u00ec.","D. c\u00f3 \u0111\u01b0\u1eddng k\u00e9o d\u00e0i \u0111i qua ti\u00eau \u0111i\u1ec3m c\u1ee7a th\u1ea5u k\u00ednh."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3472},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Khi n\u00f3i v\u1ec1 th\u1ea5u k\u00ednh ph\u00e2n k\u00ec, c\u00e2u ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 sai ? ","select":["A. Th\u1ea5u k\u00ednh ph\u00e2n k\u00ec c\u00f3 ph\u1ea7n r\u00eca d\u00e0y h\u01a1n ph\u1ea7n gi\u1eefa.","B. Tia t\u1edbi song song v\u1edbi tr\u1ee5c ch\u00ednh th\u00ec tia l\u00f3 k\u00e9o d\u00e0i \u0111i qua ti\u00eau \u0111i\u1ec3m c\u1ee7a th\u1ea5u k\u00ednh.","C. Tia t\u1edbi \u0111\u1ebfn quang t\u00e2m c\u1ee7a th\u1ea5u k\u00ednh, tia l\u00f3 ti\u1ebfp t\u1ee5c truy\u1ec1n th\u1eb3ng theo h\u01b0\u1edbng c\u1ee7a tia t\u1edbi.","D. Tia t\u1edbi song song v\u1edbi tr\u1ee5c ch\u00ednh th\u00ec tia l\u00f3 \u0111i qua ti\u00eau \u0111i\u1ec3m c\u1ee7a th\u1ea5u k\u00ednh."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3473},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai44/lv2/img\/4.jpg'\/><\/center>Ti\u1ebft di\u1ec7n c\u1ee7a m\u1ed9t s\u1ed1 th\u1ea5u k\u00ednh ph\u00e2n k\u00ec b\u1ecb c\u1eaft theo m\u1ed9t m\u1eb7t ph\u1eb3ng vu\u00f4ng g\u00f3c v\u1edbi m\u1eb7t th\u1ea5u k\u00ednh \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 trong c\u00e1c h\u00ecnh ","select":["A. a, b, c.","B. b, c, d.","C. c, d, a.","D. d, a, b."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3474},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai44/lv2/img\/5.jpg'\/><\/center>K\u00ed hi\u1ec7u th\u1ea5u k\u00ednh ph\u00e2n k\u00ec \u0111\u01b0\u1ee3c v\u1ebd nh\u01b0 h\u00ecnh: ","select":["A. h\u00ecnh a.","B. h\u00ecnh b.","C. h\u00ecnh c.","D. h\u00ecnh d."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3475},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Tia s\u00e1ng qua th\u1ea5u k\u00ednh ph\u00e2n k\u00ec kh\u00f4ng b\u1ecb \u0111\u1ed5i h\u01b0\u1edbng l\u00e0 ","select":["A. tia t\u1edbi song song tr\u1ee5c ch\u00ednh th\u1ea5u k\u00ednh.","B. tia t\u1edbi b\u1ea5t k\u00ec qua quang t\u00e2m c\u1ee7a th\u1ea5u k\u00ednh.","C. tia t\u1edbi qua ti\u00eau \u0111i\u1ec3m c\u1ee7a th\u1ea5u k\u00ednh.","D. tia t\u1edbi c\u00f3 h\u01b0\u1edbng qua ti\u00eau \u0111i\u1ec3m (kh\u00e1c ph\u00eda v\u1edbi tia t\u1edbi so v\u1edbi th\u1ea5u k\u00ednh) cu\u0309a th\u00e2\u0301u ki\u0301nh."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3476},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Chi\u1ebfu ch\u00f9m tia t\u1edbi song song v\u1edbi tr\u1ee5c ch\u00ednh c\u1ee7a m\u1ed9t th\u1ea5u k\u00ednh ph\u00e2n k\u00ec th\u00ec ","select":["A. ch\u00f9m tia l\u00f3 l\u00e0 ch\u00f9m s\u00e1ng song song.","B. ch\u00f9m tia l\u00f3 l\u00e0 ch\u00f9m s\u00e1ng ph\u00e2n k\u00ec.","C. ch\u00f9m tia l\u00f3 l\u00e0 ch\u00f9m s\u00e1ng h\u1ed9i t\u1ee5.","D. kh\u00f4ng c\u00f3 ch\u00f9m tia l\u00f3 v\u00ec \u00e1nh s\u00e1ng b\u1ecb ph\u1ea3n x\u1ea1 ho\u00e0n to\u00e0n."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3477},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Th\u1ea5u k\u00ednh ph\u00e2n k\u00ec c\u00f3 th\u1ec3 ","select":["A. l\u00e0m k\u00ednh \u0111eo ch\u1eefa t\u1eadt c\u1eadn th\u1ecb.","B. l\u00e0m k\u00ednh l\u00fap \u0111\u1ec3 quan s\u00e1t nh\u1eefng v\u1eadt nh\u1ecf.","C. l\u00e0m k\u00ednh hi\u1ec3n vi \u0111\u1ec3 quan s\u00e1t nh\u1eefng v\u1eadt r\u1ea5t nh\u1ecf.","D. l\u00e0m k\u00ednh chi\u1ebfu h\u1eadu tr\u00ean xe \u00f4 t\u00f4."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3478},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Khi no\u0301i v\u00ea\u0300 hi\u0300nh da\u0323ng cu\u0309a th\u00e2\u0301u ki\u0301nh ph\u00e2n ki\u0300, nh\u00e2\u0323n \u0111i\u0323nh na\u0300o sau \u0111\u00e2y la\u0300 sai? ","select":["A. Th\u00e2\u0301u ki\u0301nh co\u0301 hai m\u0103\u0323t \u0111\u00ea\u0300u la\u0300 m\u0103\u0323t c\u00e2\u0300u l\u00f4\u0300i.","B. Th\u00e2\u0301u ki\u0301nh co\u0301 m\u00f4\u0323t m\u0103\u0323t ph\u0103\u0309ng, m\u00f4\u0323t m\u0103\u0323t c\u00e2\u0300u lo\u0303m.","C. Th\u00e2\u0301u ki\u0301nh co\u0301 hai m\u0103\u0323t \u0111\u00ea\u0300u la\u0300 m\u0103\u0323t c\u00e2\u0300u lo\u0303m.","D. Th\u00e2\u0301u ki\u0301nh co\u0301 m\u00f4\u0323t m\u0103\u0323t c\u00e2\u0300u l\u00f4\u0300i, m\u00f4\u0323t m\u0103\u0323t c\u00e2\u0300u lo\u0303m, \u0111\u00f4\u0323 cong m\u0103\u0323t c\u00e2\u0300u l\u00f4\u0300i i\u0301t h\u01a1n m\u0103\u0323t c\u00e2\u0300u lo\u0303m."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3479},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Kho\u1ea3ng c\u00e1ch gi\u1eefa hai ti\u00eau \u0111i\u1ec3m c\u1ee7a th\u1ea5u k\u00ednh ph\u00e2n k\u00ec b\u1eb1ng ","select":["A. ti\u00eau c\u1ef1 c\u1ee7a th\u1ea5u k\u00ednh.","B. hai l\u1ea7n ti\u00eau c\u1ef1 c\u1ee7a th\u1ea5u k\u00ednh.","C. b\u1ed1n l\u1ea7n ti\u00eau c\u1ef1 c\u1ee7a th\u1ea5u k\u00ednh.","D. m\u1ed9t n\u1eeda ti\u00eau c\u1ef1 c\u1ee7a th\u1ea5u k\u00ednh."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3480},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai44/lv2/img\/11.jpg'\/><\/center>X\u00e9t \u0111\u01b0\u1eddng \u0111i c\u1ee7a tia s\u00e1ng qua th\u1ea5u k\u00ednh, th\u1ea5u k\u00ednh \u1edf h\u00ecnh n\u00e0o l\u00e0 th\u1ea5u k\u00ednh ph\u00e2n k\u00ec? ","select":["A. h\u00ecnh a.","B. h\u00ecnh b.","C. h\u00ecnh c.","D. h\u00ecnh d."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3481},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"D\u00f9ng m\u1ed9t th\u1ea5u k\u00ednh ph\u00e2n k\u1ef3 h\u1ee9ng \u00e1nh s\u00e1ng M\u1eb7t Tr\u1eddi theo ph\u01b0\u01a1ng song song v\u1edbi tr\u1ee5c ch\u00ednh c\u1ee7a th\u1ea5u k\u00ednh th\u00ec ","select":["A. ch\u00f9m tia l\u00f3 l\u00e0 ch\u00f9m tia h\u1ed9i t\u1ee5 t\u1ea1i ti\u00eau \u0111i\u1ec3m c\u1ee7a th\u1ea5u k\u00ednh.","B. ch\u00f9m tia l\u00f3 l\u00e0 ch\u00f9m tia song song.","C. ch\u00f9m tia l\u00f3 l\u00e0 ch\u00f9m tia ph\u00e2n k\u1ef3.","D. ch\u00f9m tia l\u00f3 ti\u1ebfp t\u1ee5c truy\u1ec1n th\u1eb3ng."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3482},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Tia t\u1edbi song song tr\u1ee5c ch\u00ednh m\u1ed9t th\u1ea5u k\u00ednh ph\u00e2n k\u00ec, cho tia l\u00f3 c\u00f3 \u0111\u01b0\u1eddng k\u00e9o d\u00e0i c\u1eaft tr\u1ee5c ch\u00ednh t\u1ea1i m\u1ed9t \u0111i\u1ec3m c\u00e1ch quang t\u00e2m O c\u1ee7a th\u1ea5u k\u00ednh 15cm. Ti\u00eau c\u1ef1 c\u1ee7a th\u1ea5u k\u00ednh n\u00e0y l\u00e0 ","select":["A. 15cm.","B. 20cm.","C. 25cm.","D. 30cm."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3483},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"M\u1ed9t th\u1ea5u k\u00ednh ph\u00e2n k\u00ec c\u00f3 ti\u00eau c\u1ef1 25cm. Kho\u1ea3ng c\u00e1ch gi\u1eefa hai ti\u00eau \u0111i\u1ec3m F v\u00e0 F\u2019 l\u00e0 ","select":["A. 12,5cm.","B. 25cm.","C. 37,5cm.","D. 50cm."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3484},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"\u0110\u1ec3 c\u00f3 tia l\u00f3 song song v\u1edbi tr\u1ee5c ch\u00ednh c\u1ee7a m\u1ed9t th\u1ea5u k\u00ednh ph\u00e2n ky\u0300 th\u00ec ","select":["A. tia t\u1edbi song song tr\u1ee5c ch\u00ednh.","B. tia t\u1edbi c\u00f3 h\u01b0\u1edbng qua ti\u00eau \u0111i\u1ec3m (c\u00f9ng ph\u00eda v\u1edbi tia t\u1edbi so v\u1edbi th\u1ea5u k\u00ednh).","C. tia t\u1edbi c\u00f3 h\u01b0\u1edbng qua ti\u00eau \u0111i\u1ec3m (kh\u00e1c ph\u00eda v\u1edbi tia t\u1edbi so v\u1edbi th\u1ea5u k\u00ednh).","D. tia t\u1edbi b\u00e2\u0301t ki\u0300 co\u0301 h\u01b0\u01a1\u0301ng kh\u00f4ng qua ca\u0301c ti\u00eau \u0111i\u00ea\u0309m."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3485},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai44/lv2/img\/16.jpg'\/><\/center>Trong ba h\u00ecnh v\u1ebd sau \u0111\u00e2y, SI l\u00e0 tia t\u1edbi, IR l\u00e0 tia l\u00f3 qua th\u1ea5u k\u00ednh L. Th\u1ea5u k\u00ednh trong c\u00e1c h\u00ecnh n\u00e0o l\u00e0 th\u1ea5u k\u00ednh ph\u00e2n k\u00ec? ","select":["A. h\u00ecnh a v\u00e0 h\u00ecnh b.","B. h\u00ecnh a v\u00e0 h\u00ecnh c.","C. h\u00ecnh b v\u00e0 h\u00ecnh c.","D. h\u00ecnh a, h\u00ecnh b v\u00e0 h\u00ecnh c."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3486},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai44/lv2/img\/17.jpg'\/><\/center>C\u00e1c h\u00ecnh 1, 2, 3, 4 bi\u1ec3u di\u1ec5n \u0111\u01b0\u1eddng truy\u1ec1n c\u1ee7a tia s\u00e1ng qua m\u1ed9t th\u1ea5u k\u00ednh. K\u1ebft lu\u1eadn n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang? ","select":["A. h\u00ecnh 1, 2, 3 l\u00e0 th\u1ea5u k\u00ednh ph\u00e2n k\u00ec, 4 l\u00e0 th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5.","B. h\u00ecnh 1, 3, 4 l\u00e0 th\u1ea5u k\u00ednh ph\u00e2n k\u00ec; 2 l\u00e0 th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5.","C. h\u00ecnh 1, 2, 4 l\u00e0 th\u1ea5u k\u00ednh ph\u00e2n k\u00ec; 3 l\u00e0 th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5.","D. h\u00ecnh 1,2 l\u00e0 th\u1ea5u k\u00ednh ph\u00e2n k\u00ec; 3, 4 l\u00e0 th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3487},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Khi n\u00f3i v\u1ec1 \u0111\u01b0\u1eddng \u0111i c\u1ee7a tia s\u00e1ng qua th\u1ea5u k\u00ednh ph\u00e2n k\u00ec, ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 sai ","select":["A. M\u1ed9t ch\u00f9m tia s\u00e1ng song song v\u1edbi tr\u1ee5c ch\u00ednh qua th\u1ea5u k\u00ednh th\u00ec ch\u00f9m tia l\u00f3 c\u00f3 \u0111\u01b0\u1eddng k\u00e9o d\u00e0i \u0111i qua ti\u00eau \u0111i\u1ec3m \u1ea3nh tr\u01b0\u1edbc th\u1ea5u k\u00ednh","B. Tia s\u00e1ng \u0111i qua quang t\u00e2m c\u1ee7a th\u1ea5u k\u00ednh th\u00ec truy\u1ec1n th\u1eb3ng qua th\u1ea5u k\u00ednh","C. M\u1ed9t ch\u00f9m tia s\u00e1ng h\u1ed9i t\u1ee5 t\u1ea1i ti\u00eau \u0111i\u1ec3m \u1ea3nh t\u1edbi th\u1ea5u k\u00ednh th\u00ec ch\u00f9m tia l\u00f3 \u0111i song song v\u1edbi tr\u1ee5c ch\u00ednh.","D. Tia s\u00e1ng \u0111i song song v\u1edbi tr\u1ee5c ch\u00ednh th\u00ec tia l\u00f3 c\u00f3 \u0111\u01b0\u1eddng k\u00e9o d\u00e0i \u0111i qua ti\u00eau \u0111i\u1ec3m ch\u00ednh c\u1ee7a th\u1ea5u k\u00ednh."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3488},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Khi f < d < 2f, \u1ea3nh c\u1ee7a v\u1eadt qua th\u1ea5u k\u00ednh l\u00e0 ","select":["A. \u1ea2nh th\u1eadt, ng\u01b0\u1ee3c chi\u1ec1u v\u00e0 l\u1edbn h\u01a1n v\u1eadt","B. \u1ea2nh \u1ea3o, c\u00f9ng chi\u1ec1u v\u00e0 nh\u1ecf h\u01a1n v\u1eadt","C. \u1ea2nh \u1ea3o, ng\u01b0\u1ee3c chi\u1ec1u v\u00e0 nh\u1ecf h\u01a1n v\u1eadt","D. \u1ea2nh th\u1eadt, c\u00f9ng chi\u1ec1u v\u00e0 nh\u1ecf h\u01a1n v\u1eadt."],"hint":"","explain":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai44/lv2/img\/19a.jpg'\/><\/center><span class='basic_left'>Khi f < d < 2f, v\u1eadt \u1edf trong \u0111o\u1ea1n FI (h\u00ecnh v\u1ebd) <br\/>\u1ea2nh th\u1eadt, ng\u01b0\u1ee3c chi\u1ec1u, l\u1edbn h\u01a1n v\u1eadt v\u00e0 n\u1eb1m ngo\u00e0i kho\u1ea3ng OI\u2019.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3489},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Th\u1ea5u k\u00ednh ph\u00e2n k\u00ec l\u00e0 lo\u1ea1i th\u1ea5u k\u00ednh ","select":["A. c\u00f3 ph\u1ea7n r\u00eca d\u00e0y h\u01a1n ph\u1ea7n gi\u1eefa.","B. c\u00f3 ph\u1ea7n r\u00eca m\u1ecfng h\u01a1n ph\u1ea7n gi\u1eefa.","C. bi\u1ebfn \u0111\u1ed5i ch\u00f9m tia t\u1edbi song song th\u00e0nh ch\u00f9m tia l\u00f3 h\u1ed9i t\u1ee5.","D. c\u00f3 th\u00ea\u0309 la\u0300m b\u0103\u0300ng ch\u00e2\u0301t r\u0103\u0301n kh\u00f4ng trong su\u00f4\u0301t."],"hint":"","explain":"<span class='basic_left'> <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3490}],"lesson":{"save":0,"level":2}}