{"segment":[{"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":" Ch\u00f9m tia s\u00e1ng \u0111i qua th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 m\u00f4 t\u1ea3 hi\u1ec7n t\u01b0\u1ee3ng ","select":["A. Truy\u1ec1n th\u1eb3ng \u00e1nh s\u00e1ng.","B. T\u00e1n x\u1ea1 \u00e1nh s\u00e1ng.","C. Ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng.","D. Kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng. "],"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":3431},{"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":"C\u00e2u n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang khi n\u00f3i v\u1ec1 th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 ","select":["A. Tr\u1ee5c ch\u00ednh c\u1ee7a th\u1ea5u k\u00ednh l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng b\u1ea5t k\u1ef3.","B. Quang t\u00e2m c\u1ee7a th\u1ea5u k\u00ednh c\u00e1ch \u0111\u1ec1u hai ti\u00eau \u0111i\u1ec3m.","C. Ti\u00eau \u0111i\u1ec3m c\u1ee7a th\u1ea5u k\u00ednh ph\u1ee5 thu\u1ed9c v\u00e0o di\u1ec7n t\u00edch c\u1ee7a th\u1ea5u k\u00ednh.","D. Kho\u1ea3ng c\u00e1ch gi\u1eefa hai ti\u00eau \u0111i\u1ec3m g\u1ecdi l\u00e0 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":1}]}],"id_ques":3432},{"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":"Tr\u1ee5c ch\u00ednh c\u1ee7a th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng ","select":["A. b\u1ea5t k\u1ef3 \u0111i qua quang t\u00e2m c\u1ee7a th\u1ea5u k\u00ednh.","B. \u0111i qua hai ti\u00eau \u0111i\u1ec3m c\u1ee7a th\u1ea5u k\u00ednh . ","C. ti\u1ebfp tuy\u1ebfn c\u1ee7a th\u1ea5u k\u00ednh t\u1ea1i quang t\u00e2m.","D. \u0111i qua m\u00f4\u0323t ti\u00eau \u0111i\u1ec3m v\u00e0 song song v\u1edbi 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":1}]}],"id_ques":3433},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai42/lv2/img\/4.jpg'\/><\/center>H\u00ecnh v\u1ebd n\u00e0o m\u00f4 t\u1ea3 \u0111\u00fang \u0111\u01b0\u1eddng truy\u1ec1n c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c tia s\u00e1ng qua tr\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 ","select":["A. 1.","B. 2.","C. 3.","D. 4."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3434},{"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/bai42/lv2/img\/5.jpg'\/><\/center>B\u00ean trong h\u1ed9p k\u00ednh c\u1ee7a h\u00ecnh v\u1ebd n\u00e0o c\u00f3 ch\u1ee9a th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 ","select":["A. 1, 2.","B. 1, 3.","C. 1, 2, 3.","D. 2, 3."],"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":3435},{"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":" Th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 l\u00e0 lo\u1ea1i th\u1ea5u k\u00ednh c\u00f3 ","select":["A. ph\u1ea7n r\u00eca d\u00e0y h\u01a1n ph\u1ea7n gi\u1eefa.","B. ph\u1ea7n r\u00eca m\u1ecfng h\u01a1n ph\u1ea7n gi\u1eefa.","C. ph\u1ea7n r\u00eca v\u00e0 ph\u1ea7n gi\u1eefa b\u1eb1ng nhau.","D. h\u00ecnh d\u1ea1ng b\u1ea5t k\u1ef3."],"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":3436},{"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":" Ti\u00eau c\u1ef1 c\u1ee7a th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 l\u00e0m b\u1eb1ng th\u1ee7y tinh c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m ","select":["A. thay \u0111\u1ed5i \u0111\u01b0\u1ee3c.","B. kh\u00f4ng thay \u0111\u1ed5i \u0111\u01b0\u1ee3c.","C. c\u00e1c th\u1ea5u k\u00ednh c\u00f3 ti\u00eau c\u1ef1 nh\u01b0 nhau.","D. th\u1ea5u k\u00ednh d\u00e0y h\u01a1n c\u00f3 ti\u00eau c\u1ef1 l\u1edbn h\u01a1n."],"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":3437},{"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/bai42/lv2/img\/8.jpg'\/><\/center>C\u00e1c h\u00ecnh \u0111\u01b0\u1ee3c v\u1ebd c\u00f9ng t\u1ec9 l\u1ec7. H\u00ecnh v\u1ebd n\u00e0o m\u00f4 t\u1ea3 ti\u00eau c\u1ef1 c\u1ee7a th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 l\u00e0 l\u1edbn nh\u1ea5t ","select":["A. 1","B. 2.","C. 3.","D. 4."],"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":3438},{"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":"K\u00fd hi\u1ec7u c\u1ee7a quang t\u00e2m v\u00e0 ti\u00eau c\u1ef1 c\u1ee7a th\u1ea5u k\u00ednh l\u1ea7n l\u01b0\u1ee3t l\u00e0 ","select":["A. O v\u00e0 F.","B. f v\u00e0 F.","C. f v\u00e0 d.","D. O v\u00e0 f."],"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":3439},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai42/lv2/img\/12.jpg'\/><\/center>K\u00fd hi\u1ec7u c\u1ee7a th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 l\u00e0 ","select":["A. h\u00ecnh 1.","B. h\u00ecnh 2.","C. h\u00ecnh 3.","D. h\u00ecnh 4."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3440},{"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":"Th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m bi\u1ebfn \u0111\u1ed5i ch\u00f9m tia t\u1edbi song song th\u00e0nh ","select":["A. ch\u00f9m tia ph\u1ea3n x\u1ea1.","B. ch\u00f9m tia l\u00f3 h\u1ed9i t\u1ee5.","C. ch\u00f9m tia l\u00f3 ph\u00e2n k\u1ef3.","D. ch\u00f9m tia l\u00f3 song song kh\u00e1c."],"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":3441},{"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/bai42/lv2/img\/14.jpg'\/><\/center>M\u1ed9t tia s\u00e1ng chi\u1ebfu t\u1edbi quang t\u00e2m c\u1ee7a m\u1ed9t th\u1ea5u k\u00ednh nh\u01b0 trong h\u00ecnh v\u1ebd. Tia l\u00f3 s\u1ebd \u0111i theo h\u01b0\u1edbng ","select":["A. a.","B. b.","C. c.","D. 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":3442},{"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":"Ti\u00eau \u0111i\u1ec3m c\u1ee7a th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m ","select":["A. l\u00e0 m\u1ed9t \u0111i\u1ec3m b\u1ea5t k\u1ef3 tr\u00ean tr\u1ee5c ch\u00ednh c\u1ee7a th\u1ea5u k\u00ednh.","B. m\u1ed7i th\u1ea5u k\u00ednh ch\u1ec9 c\u00f3 m\u1ed9t ti\u00eau \u0111i\u1ec3m \u1edf sau th\u1ea5u k\u00ednh.","C. m\u1ed7i th\u1ea5u k\u00ednh ch\u1ec9 c\u00f3 m\u1ed9t ti\u00eau \u0111i\u1ec3m \u1edf tr\u01b0\u1edbc th\u1ea5u k\u00ednh.","D. m\u1ed7i th\u1ea5u k\u00ednh c\u00f3 hai ti\u00eau \u0111i\u1ec3m \u0111\u1ed1i x\u1ee9ng nhau qua 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":3443},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai42/lv2/img\/16.jpg'\/><\/center>Nh\u1eefng th\u1ea5u k\u00ednh n\u00e0o trong h\u00ecnh v\u1ebd l\u00e0 c\u00e1c th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5","select":["A. 1, 2, 3, 4.","B. 2, 3, 4.","C. 1, 2, 3.","D. 1, 3, 4."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3444},{"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":"Tia t\u1edbi \u0111i qua quang t\u00e2m c\u1ee7a th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 cho tia l\u00f3 ","select":["A. \u0111i qua ti\u00eau \u0111i\u1ec3m.","B. song song v\u1edbi tr\u1ee5c ch\u00ednh.","C. truy\u1ec1n th\u1eb3ng theo ph\u01b0\u01a1ng c\u1ee7a tia t\u1edbi.","D. c\u00f3 \u0111\u01b0\u1eddng k\u00e9o d\u00e0i \u0111i qua ti\u00eau \u0111i\u1ec3m."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3445},{"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 h\u1ed9i t\u1ee5 cho tia l\u00f3 ","select":["A. \u0111i qua \u0111i\u1ec3m gi\u1eefa quang t\u00e2m v\u00e0 ti\u00eau \u0111i\u1ec3m.","B. song song v\u1edbi tr\u1ee5c ch\u00ednh.","C. truy\u1ec1n th\u1eb3ng theo ph\u01b0\u01a1ng c\u1ee7a tia t\u1edbi.","D. \u0111i qua ti\u00eau \u0111i\u1ec3m."],"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":3446},{"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":"Tia t\u1edbi \u0111i qua ti\u00eau \u0111i\u1ec3m c\u1ee7a th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 cho tia l\u00f3 ","select":["A. truy\u1ec1n th\u1eb3ng theo ph\u01b0\u01a1ng c\u1ee7a tia t\u1edbi. ","B. \u0111i qua \u0111i\u1ec3m gi\u1eefa quang t\u00e2m v\u00e0 ti\u00eau \u0111i\u1ec3m.","C. song song v\u1edbi tr\u1ee5c ch\u00ednh.","D. c\u00f3 \u0111\u01b0\u1eddng k\u00e9o d\u00e0i \u0111i qua ti\u00eau \u0111i\u1ec3m."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3447},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai42/lv2/img\/20.jpg'\/><\/center>H\u00ecnh v\u1ebd n\u00e0o m\u00f4 t\u1ea3 \u0111\u00fang \u0111\u01b0\u1eddng truy\u1ec1n c\u1ee7a c\u00e1c tia s\u00e1ng qua th\u1ea5u k\u00ednh h\u1ed9i t\u1ee5 ","select":["A. 1.","B. 2.","C. 3.","D. 4."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3448},{"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/bai42/lv2/img\/21.jpg'\/><\/center>Trong h\u00ecnh v\u1ebd, tia s\u00e1ng c\u00f3 tia t\u1edbi c\u00f9ng ph\u01b0\u01a1ng v\u1edbi tia l\u00f3 l\u00e0 ","select":["A. tia 1.","B. tia 2 v\u00e0 3.","C. tia 3.","D. tia 1 v\u00e0 3."],"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":3449},{"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/bai42/lv2/img\/22.jpg'\/><\/center>Trong h\u00ecnh v\u1ebd, tia s\u00e1ng c\u00f3 tia t\u1edbi song song v\u1edbi tr\u1ee5c ch\u00ednh l\u00e0 ","select":["A. Tia 1 v\u00e0 3.","B. Tia 2.","C. Tia 3.","D. Tia 2 v\u00e0 3."],"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":3450}],"lesson":{"save":0,"level":2}}