{"segment":[{"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":"C\u00f3 m\u1ed9t tia s\u00e1ng chi\u1ebfu t\u1eeb kh\u00f4ng kh\u00ed xi\u00ean g\u00f3c v\u00e0o m\u1eb7t n\u01b0\u1edbc th\u00ec:","select":["A. G\u00f3c kh\u00fac x\u1ea1 s\u1ebd l\u1edbn h\u01a1n g\u00f3c t\u1edbi.","B. G\u00f3c kh\u00fac x\u1ea1 s\u1ebd b\u1eb1ng g\u00f3c t\u1edbi.","C. G\u00f3c kh\u00fac x\u1ea1 s\u1ebd nh\u1ecf h\u01a1n g\u00f3c t\u1edbi.","D. C\u1ea3 ba tr\u01b0\u1eddng h\u1ee3p A, B, C \u0111\u1ec1u c\u00f3 th\u1ec3 x\u1ea3y ra."],"hint":"","explain":"<span class='basic_left'>Khi tia s\u00e1ng \u0111i t\u1eeb kh\u00f4ng kh\u00ed sang c\u00e1c m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t r\u1eafn, l\u1ecfng kh\u00e1c nhau th\u00ec g\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n g\u00f3c t\u1edbi v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3411},{"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":"M\u1ed9t tia s\u00e1ng ph\u00e1t ra t\u1eeb m\u1ed9t b\u00f3ng \u0111\u00e8n trong m\u1ed9t b\u1ec3 c\u00e1 c\u1ea3nh, chi\u1ebfu l\u00ean tr\u00ean, xuy\u00ean g\u00f3c v\u00e0o m\u1eb7t n\u01b0\u1edbc v\u00e0 l\u00f3 ra ngo\u00e0i kh\u00f4ng kh\u00ed th\u00ec:","select":["A. G\u00f3c kh\u00fac x\u1ea1 s\u1ebd l\u1edbn h\u01a1n g\u00f3c t\u1edbi.","B. G\u00f3c kh\u00fac x\u1ea1 s\u1ebd b\u1eb1ng g\u00f3c t\u1edbi.","C. G\u00f3c kh\u00fac x\u1ea1 s\u1ebd nh\u1ecf h\u01a1n g\u00f3c t\u1edbi.","D. C\u1ea3 ba tr\u01b0\u1eddng h\u1ee3p A, B, C \u0111\u1ec1u c\u00f3 th\u1ec3 x\u1ea3y ra."],"hint":"","explain":"<span class='basic_left'>M\u1ed9t tia s\u00e1ng ph\u00e1t ra t\u1eeb m\u1ed9t b\u00f3ng \u0111\u00e8n trong m\u1ed9t b\u1ec3 c\u00e1 c\u1ea3nh, chi\u1ebfu l\u00ean tr\u00ean, xuy\u00ean g\u00f3c v\u00e0o m\u1eb7t n\u01b0\u1edbc v\u00e0 l\u00f3 ra ngo\u00e0i kh\u00f4ng kh\u00ed th\u00ec: g\u00f3c kh\u00fac x\u1ea1 s\u1ebd l\u1edbn h\u01a1n g\u00f3c t\u1edbi.<br\/>V\u00ec: Khi tia s\u00e1ng \u0111i t\u1eeb kh\u00f4ng kh\u00ed sang c\u00e1c m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t r\u1eafn, l\u1ecfng kh\u00e1c nhau th\u00ec g\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n g\u00f3c t\u1edbi v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3412},{"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 tia s\u00e1ng \u0111i t\u1eeb kh\u00f4ng kh\u00ed sang c\u00e1c m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t r\u1eafn, l\u1ecfng kh\u00e1c nhau v\u1edbi g\u00f3c t\u1edbi l\u00e0 $60{}^\\circ $ ","select":["A. G\u00f3c kh\u00fac x\u1ea1 l\u1edbn h\u01a1n $60{}^\\circ $.","B. G\u00f3c kh\u00fac x\u1ea1 b\u1eb1ng $60{}^\\circ $.","C. G\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n $60{}^\\circ $.","D. C\u1ea3 ba c\u00e2u A, B, C \u0111\u1ec1u sai"],"hint":"","explain":"<span class='basic_left'>Khi tia s\u00e1ng \u0111i t\u1eeb kh\u00f4ng kh\u00ed sang c\u00e1c m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t r\u1eafn, l\u1ecfng kh\u00e1c nhau th\u00ec g\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n g\u00f3c t\u1edbi, n\u00ean g\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n $60{}^\\circ $.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3413},{"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":"Chi\u1ebfu m\u1ed9t tia s\u00e1ng t\u1eeb trong n\u01b0\u1edbc ra kh\u00f4ng kh\u00ed, v\u1edbi g\u00f3c t\u1edbi b\u1eb1ng $30{}^\\circ $ th\u00ec:","select":["A. G\u00f3c kh\u00fac x\u1ea1 l\u1edbn h\u01a1n $30{}^\\circ $.","B. G\u00f3c kh\u00fac x\u1ea1 b\u1eb1ng $30{}^\\circ $.","C. G\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n $30{}^\\circ $.","D. C\u1ea3 ba c\u00e2u A, B, C \u0111\u1ec1u sai."],"hint":"","explain":"<span class='basic_left'>Khi tia s\u00e1ng \u0111i t\u1eeb kh\u00f4ng kh\u00ed sang c\u00e1c m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t r\u1eafn, l\u1ecfng kh\u00e1c nhau th\u00ec g\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n g\u00f3c t\u1edbi v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3414},{"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":"M\u1ed9t con c\u00e1 v\u00e0ng \u0111ang b\u01a1i trong m\u1ed9t b\u1ec3 c\u00e1 c\u1ea3nh c\u00f3 th\u00e0nh b\u1eb1ng th\u1ee7y tinh trong su\u1ed1t. M\u1ed9t ng\u01b0\u1eddi ng\u1eafm con c\u00e1 qua th\u00e0nh b\u1ec3. H\u1ecfi tia s\u00e1ng truy\u1ec1n t\u1eeb con c\u00e1 \u0111\u1ebfn m\u1eaft ng\u01b0\u1eddi \u0111\u00f3 \u0111\u00e3 ch\u1ecbu bao nhi\u00eau l\u1ea7n kh\u00fac x\u1ea1?","select":["A. Kh\u00f4ng l\u1ea7n n\u00e0o.","B. M\u1ed9t l\u1ea7n.","C. Hai l\u1ea7n.","D. Ba l\u1ea7n"],"hint":"","explain":"<span class='basic_left'>Hai l\u1ea7n kh\u00fac x\u1ea1 v\u00ec kh\u00fac x\u1ea1 l\u1ea7n th\u1ee9 nh\u1ea5t t\u1eeb n\u01b0\u1edbc qua th\u00e0nh th\u1ee7y tinh, kh\u00fac x\u1ea1 l\u1ea7n th\u1ee9 hai t\u1eeb th\u00e0nh th\u1ee7y tinh qua kh\u00f4ng kh\u00ed \u0111\u1ebfn m\u1eaft.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 .<\/span><\/span> ","column":2}]}],"id_ques":3415},{"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/bai41/lv2/img\/h6.jpg'\/><\/center>M\u1ed9t \u0111\u1ed3ng ti\u1ec1n xu \u0111\u1eb7t trong m\u1ed9t c\u00e1i b\u00e1t. H\u00e3y cho bi\u1ebft, t\u1ea1i sao khi ch\u01b0a c\u00f3 n\u01b0\u1edbc th\u00ec kh\u00f4ng th\u1ea5y \u0111\u1ed3ng xu, nh\u01b0ng khi cho n\u01b0\u1edbc v\u00e0o th\u00ec l\u1ea1i tr\u00f4ng th\u1ea5y \u0111\u1ed3ng xu.","select":["A. V\u00ec c\u00f3 s\u1ef1 ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n.","B. C\u1ea3 ba ph\u01b0\u01a1ng \u00e1n \u0111\u1ec1u \u0111\u00fang.","C. V\u00ec c\u00f3 s\u1ef1 t\u00e1n x\u1ea1 \u00e1nh s\u00e1ng.","D. V\u00ec c\u00f3 s\u1ef1 kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng."],"hint":"","explain":"<span class='basic_left'>Khi ch\u01b0a c\u00f3 n\u01b0\u1edbc th\u00ec kh\u00f4ng th\u1ea5y \u0111\u1ed3ng xu, nh\u01b0ng khi cho n\u01b0\u1edbc v\u00e0o th\u00ec l\u1ea1i tr\u00f4ng th\u1ea5y \u0111\u1ed3ng xu v\u00ec c\u00f3 s\u1ef1 kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3416},{"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\u1ec3 c\u00f3 th\u1ec3 b\u1eaft ch\u00ednh x\u00e1c con c\u00e1 d\u01b0\u1edbi n\u01b0\u1edbc, con c\u00f2 ph\u1ea3i:","select":["A. B\u1eaft th\u1eb3ng \u0111\u1ee9ng t\u1eeb tr\u00ean xu\u1ed1ng.(2)","B. Nh\u00ecn theo ph\u01b0\u01a1ng nghi\u00eang \u0111\u1ec3 b\u1eaft c\u00e1 cho g\u1ea7n h\u01a1n.(1)","C. Kh\u00f4ng s\u1ee7 d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p n\u00e0o.","D. S\u1eed d\u1ee5ng c\u1ea3 hai ph\u01b0\u01a1ng ph\u00e1p (1) v\u00e0 (2)."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ec3 c\u00f3 th\u1ec3 b\u1eaft ch\u00ednh x\u00e1c con c\u00e1 d\u01b0\u1edbi n\u01b0\u1edbc, con c\u00f2 ph\u1ea3i b\u1eaft th\u1eb3ng \u0111\u1ee9ng t\u1eeb tr\u00ean xu\u1ed1ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3417},{"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/bai41/lv2/img\/h8.jpg'\/><\/center>Ng\u01b0\u1eddi ta th\u1ea3 m\u1ed9t n\u00fat b\u1ea5c m\u1ecfng h\u00ecnh tr\u00f2n n\u1ed5i tr\u00ean m\u1eb7t tho\u00e1ng m\u1ed9t ch\u1eadu \u0111\u1ef1ng n\u01b0\u1edbc b\u1eb1ng nh\u1ef1a. Ngay \u1edf t\u00e2m O c\u1ee7a n\u00fat \u1ea5y ta c\u1eafm m\u1ed9t chi\u1ebfc dinh ng\u1eafn OA theo chi\u1ec1u th\u1eb3ng \u0111\u1ee9ng, \u0111\u1ea7u A \u1edf d\u01b0\u1edbi n\u01b0\u1edbc. H\u1ecfi m\u1eaft \u0111\u1eb7t t\u1ea1i v\u1ecb tr\u00ed n\u00e0o tr\u00ean h\u00ecnh v\u1ebd \u0111\u1ec3 nh\u00ecn th\u1ea5y chi\u1ebfc \u0111inh?","select":["A. T\u1ea1i v\u1ecb tr\u00ed 2.","B. C\u1ea3 ba v\u1ecb tr\u00ed \u0111\u1ec1u kh\u00f4ng th\u1ea5y.","C. T\u1ea1i v\u1ecb tr\u00ed 3.","D. T\u1ea1i v\u1ecb tr\u00ed 1."],"hint":"","explain":"<span class='basic_left'>M\u1eaft \u0111\u1eb7t t\u1ea1i c\u1ea3 ba v\u1ecb tr\u00ed tr\u00ean h\u00ecnh v\u1ebd \u0111\u1ec1u kh\u00f4ng nh\u00ecn th\u1ea5y chi\u1ebfc \u0111inh.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3418},{"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 chi\u1ebfu m\u1ed9t ch\u00f9m tia s\u00e1ng \u0111\u1ebfn m\u1eb7t ph\u00e2n c\u00e1ch hai m\u00f4i tr\u01b0\u1eddng, hi\u1ec7n t\u01b0\u1ee3ng n\u00e0o sau \u0111\u00e2y c\u00f3 th\u1ec3 kh\u00f4ng x\u1ea3y ra?","select":["A. C\u00e2u (1) v\u00e0 (2) \u0111\u00fang.","B. Hi\u1ec7n t\u01b0\u1ee3ng ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng.(1)","C. Hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng.(2)","D. Hi\u1ec7n t\u01b0\u1ee3ng t\u00e1n x\u1ea1 \u00e1nh s\u00e1ng.(3)"],"hint":"","explain":"<span class='basic_left'>Khi chi\u1ebfu m\u1ed9t ch\u00f9m tia s\u00e1ng \u0111\u1ebfn m\u1eb7t ph\u00e2n c\u00e1ch hai m\u00f4i tr\u01b0\u1eddng, hi\u1ec7n t\u01b0\u1ee3ng t\u00e1n x\u1ea1 \u00e1nh s\u00e1ng c\u00f3 th\u1ec3 kh\u00f4ng x\u1ea3y ra<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3419},{"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/bai41/lv2/img\/h10.jpg'\/><\/center>Quan s\u00e1t h\u00ecnh v\u1ebd, h\u00ecnh n\u00e0o v\u1ebd \u0111\u00fang \u0111\u01b0\u1eddng \u0111i c\u1ee7a tia s\u00e1ng?","select":["A. H\u00ecnh d.","B. H\u00ecnh b.","C. H\u00ecnh c.","D. H\u00ecnh a."],"hint":"","explain":"<span class='basic_left'>H\u00ecnh b v\u1ebd \u0111\u00fang \u0111\u01b0\u1eddng \u0111i c\u1ee7a tia s\u00e1ng<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3420},{"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":"Hi\u1ec7n t\u01b0\u1ee3ng ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n x\u1ea3y ra khi:","select":["A. \u00c1nh s\u00e1ng chi\u1ebfu t\u1eeb n\u01b0\u1edbc v\u00e0o kh\u00f4ng kh\u00ed v\u00e0 g\u00f3c t\u1edbi l\u1edbn h\u01a1n ${100}^\\circ $.","B. \u00c1nh s\u00e1ng chi\u1ebfu t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o n\u01b0\u1edbc v\u00e0 g\u00f3c t\u1edbi l\u1edbn h\u01a1n ${48}^\\circ $.","C. \u00c1nh s\u00e1ng chi\u1ebfu t\u1eeb n\u01b0\u1edbc v\u00e0o kh\u00f4ng kh\u00ed v\u00e0 g\u00f3c t\u1edbi l\u1edbn h\u01a1n ${48,5}^\\circ $.","D. \u00c1nh s\u00e1ng chi\u1ebfu t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o n\u01b0\u1edbc v\u00e0 g\u00f3c t\u1edbi l\u1edbn h\u01a1n ${48,5}^\\circ $."],"hint":"","explain":"<span class='basic_left'>Hi\u1ec7n t\u01b0\u1ee3ng ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n x\u1ea3y ra khi \u00e1nh s\u00e1ng chi\u1ebfu t\u1eeb n\u01b0\u1edbc v\u00e0o kh\u00f4ng kh\u00ed v\u00e0 g\u00f3c t\u1edbi l\u1edbn h\u01a1n ${48,5}^\\circ $. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3421},{"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/bai41/lv2/img\/h12.jpg'\/><\/center>Khi nh\u00ecn m\u1ed9t v\u1eadt qua \u00e1nh s\u00e1ng ph\u1ea3n chi\u1ebfu t\u1eeb n\u01b0\u1edbc, ta th\u1ea5y v\u1eadt kh\u00f4ng s\u00e1ng b\u1eb1ng khi nh\u00ecn v\u1eadt \u0111\u00f3 qua g\u01b0\u01a1ng ph\u1eb3ng. V\u00ec sao?","select":["A. M\u1ed9t ph\u1ea7n \u00e1nh s\u00e1ng b\u1ecb kh\u00fac x\u1ea1 v\u00e0o n\u01b0\u1edbc.(2)","B. C\u1ea3 (1) v\u00e0 (2) \u0111\u1ec1u \u0111\u00fang.","C. C\u1ea3 (1) v\u00e0 (2) \u0111\u1ec1u sai.","D. M\u1ed9t ph\u1ea7n \u00e1nh s\u00e1ng b\u1ecb ph\u1ea3n x\u1ea1 tr\u1edf v\u00e8 m\u00f4i tr\u01b0\u1eddng kh\u00f4ng kh\u00ed.(1)"],"hint":"","explain":"<span class='basic_left'>Khi nh\u00ecn m\u1ed9t v\u1eadt qua \u00e1nh s\u00e1ng ph\u1ea3n chi\u1ebfu t\u1eeb n\u01b0\u1edbc, ta th\u1ea5y v\u1eadt kh\u00f4ng s\u00e1ng b\u1eb1ng khi nh\u00ecn v\u1eadt \u0111\u00f3 qua g\u01b0\u01a1ng ph\u1eb3ng v\u00ec m\u1ed9t ph\u1ea7n \u00e1nh s\u00e1ng b\u1ecb kh\u00fac x\u1ea1 v\u00e0o n\u01b0\u1edbc.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3422},{"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/bai41/lv2/img\/h13.jpg'\/><\/center>M\u1ed9t \u0111i\u1ec3m s\u00e1ng S c\u00e1ch m\u1eb7t n\u01b0\u1edbc m\u1ed9t kho\u1ea3ng d, m\u1ed9t th\u1ee3 l\u1eb7n \u1edf d\u01b0\u1edbi n\u01b0\u1edbc nh\u00ecn \u0111i\u1ec3m s\u00e1ng S s\u1ebd th\u1ea5y \u0111i\u1ec3m s\u00e1ng thay \u0111\u1ed5i th\u1ebf n\u00e0o so v\u1edbi tr\u00ean b\u1edd?","select":["A. C\u00e1ch xa m\u1eb7t n\u01b0\u1edbc m\u1ed9t kho\u1ea3ng l\u1edbn h\u01a1n d.","B. C\u00e1ch xa m\u1eb7t n\u01b0\u1edbc m\u1ed9t kho\u1ea3ng nh\u1ecf h\u01a1n d.","C. \u1ede ngay m\u1eb7t n\u01b0\u1edbc.","D. V\u1eabn \u1edf v\u1ecb tr\u00ed c\u0169 c\u00e1ch m\u1eb7t n\u01b0\u1edbc kho\u1ea3ng b\u1eb1ng d."],"hint":"","explain":"<span class='basic_left'>M\u1ed9t \u0111i\u1ec3m s\u00e1ng S c\u00e1ch m\u1eb7t n\u01b0\u1edbc m\u1ed9t kho\u1ea3ng d, m\u1ed9t th\u1ee3 l\u1eb7n \u1edf d\u01b0\u1edbi n\u01b0\u1edbc nh\u00ecn \u0111i\u1ec3m s\u00e1ng S s\u1ebd th\u1ea5y \u0111i\u1ec3m s\u00e1ng c\u00e1ch xa m\u1eb7t n\u01b0\u1edbc m\u1ed9t kho\u1ea3ng l\u1edbn h\u01a1n d. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3423},{"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/bai41/lv2/img\/h14.jpg'\/><\/center>L\u00e0m th\u00ed nghi\u1ec7m nh\u01b0 sau: chi\u1ebfu ch\u00f9m tia s\u00e1ng \u0111i t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o n\u01b0\u1edbc v\u1edbi g\u00f3c t\u1edbi thay \u0111\u1ed5i. H\u00e3y cho bi\u1ebft ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y ch\u00ednh x\u00e1c nh\u1ea5t?","select":["A. Tia SI ti\u1ebfn g\u1ea7n \u0111\u1ebfn NI th\u00ec tia IK ti\u1ebfn g\u1ea7n \u0111\u1ebfn IM'.","B. Tia SI ti\u1ebfn g\u1ea7n \u0111\u1ebfn NI th\u00ec tia IK ti\u1ebfn g\u1ea7n \u0111\u1ebfn IN'.","C. Tia SI thay \u0111\u1ed5i c\u00f2n tia IK kh\u00f4ng thay \u0111\u1ed5i.","D. Tia SI ti\u1ebfn g\u1ea7n \u0111\u1ebfn MI th\u00ec tia IK ti\u1ebfn g\u1ea7n \u0111\u1ebfn IN'."],"hint":"","explain":"<span class='basic_left'>L\u00e0m th\u00ed nghi\u1ec7m nh\u01b0 sau: chi\u1ebfu ch\u00f9m tia s\u00e1ng \u0111i t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o n\u01b0\u1edbc v\u1edbi g\u00f3c t\u1edbi thay \u0111\u1ed5i, ta th\u1ea5y: Tia SI ti\u1ebfn g\u1ea7n \u0111\u1ebfn NI th\u00ec tia IK ti\u1ebfn g\u1ea7n \u0111\u1ebfn IN'.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3424},{"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/bai41/lv2/img\/h15.jpg'\/><\/center>M\u1ed9t ng\u01b0\u1eddi nh\u00ecn xu\u1ed1ng m\u1ed9t \u0111i\u1ec3m s\u00e1ng S theo ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng. N\u1ebfu \u0111\u1eb7t xen gi\u1eefa m\u1eaft nh\u00ecn v\u00e0 \u0111i\u1ec3m s\u00e1ng S m\u1ed9t t\u1ea5m th\u1ee7y tinh d\u00e0y, trong su\u1ed1t th\u00ec s\u1ebd th\u1ea5y \u0111i\u1ec3m s\u00e1ng S thay \u0111\u1ed5i th\u1ebf n\u00e0o?","select":["A. V\u1eabn \u1edf v\u1ecb tr\u00ed c\u0169 S","B. \u1ede v\u1ecb tr\u00ed $S_1$, xa t\u1ea5m th\u1ee7y tinh h\u01a1n S","C. \u1ede v\u1ecb tr\u00ed $S_2$, xa t\u1ea5m th\u1ee7y tinh h\u01a1n S","D. \u1ede v\u1ecb tr\u00ed I, s\u00e1t t\u1ea5m th\u1ee7y tinh."],"hint":"","explain":"<span class='basic_left'>N\u1ebfu \u0111\u1eb7t xen gi\u1eefa m\u1eaft nh\u00ecn v\u00e0 \u0111i\u1ec3m s\u00e1ng S m\u1ed9t t\u1ea5m th\u1ee7y tinh d\u00e0y, trong su\u1ed1t th\u00ec s\u1ebd th\u1ea5y \u0111i\u1ec3m s\u00e1ng S \u1edf v\u1ecb tr\u00ed $S_2$, xa t\u1ea5m th\u1ee7y tinh h\u01a1n S<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3425},{"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":"Khi tia s\u00e1ng truy\u1ec1n t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o n\u01b0\u1edbc, g\u1ecdi i l\u00e0 g\u00f3c t\u1edbi, r l\u00e0 g\u00f3c kh\u00fac x\u1ea1 th\u00ec:","select":["A. r > i.","B. r < i.","C. r = i.","D. 2r = i."],"hint":"","explain":"Khi tia s\u00e1ng truy\u1ec1n t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o n\u01b0\u1edbc, g\u1ecdi i l\u00e0 g\u00f3c t\u1edbi, r l\u00e0 g\u00f3c kh\u00fac x\u1ea1 th\u00ec: r < i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span>","column":2}]}],"id_ques":3426},{"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 \u00e1nh s\u00e1ng truy\u1ec1n t\u1eeb kh\u00f4ng kh\u00ed sang th\u1ee7y tinh th\u00ec:","select":["A. G\u00f3c kh\u00fac x\u1ea1 r kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o g\u00f3c t\u1edbi i","B. G\u00f3c t\u1edbi i nh\u1ecf h\u01a1n g\u00f3c kh\u00fac x\u1ea1 r.","C. Khi g\u00f3c t\u1edbi i t\u0103ng th\u00ec g\u00f3c kh\u00fac x\u1ea1 r gi\u1ea3m.","D. Khi g\u00f3c t\u1edbi i t\u0103ng th\u00ec g\u00f3c kh\u00fac x\u1ea1 r t\u0103ng."],"hint":"","explain":"<span class='basic_left'>Khi \u00e1nh s\u00e1ng truy\u1ec1n t\u1eeb kh\u00f4ng kh\u00ed sang th\u1ee7y tinh th\u00ec: Khi g\u00f3c t\u1edbi i t\u0103ng th\u00ec g\u00f3c kh\u00fac x\u1ea1 r t\u0103ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3427},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"X\u00e9t m\u1ed9t tia s\u00e1ng truy\u1ec1n t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o n\u01b0\u1edbc. Th\u00f4ng tin n\u00e0o sau \u0111\u00e2y l\u00e0 sai?","select":["A. G\u00f3c t\u1edbi lu\u00f4n lu\u00f4n l\u1edbn h\u01a1n g\u00f3c kh\u00fac x\u1ea1.","B. Khi g\u00f3c t\u1edbi t\u0103ng th\u00ec g\u00f3c kh\u00fac x\u1ea1 c\u0169ng t\u0103ng.","C. Khi g\u00f3c t\u1edbi b\u1eb1ng $0{}^\\circ $ th\u00ec g\u00f3c kh\u00fac x\u1ea1 c\u0169ng b\u1eb1ng $0{}^\\circ $.","D. Khi g\u00f3c t\u1edbi b\u1eb1ng $45{}^\\circ $th\u00ec g\u00f3c kh\u00fac x\u1ea1 c\u0169ng b\u1eb1ng $45{}^\\circ $."],"hint":"","explain":"<span class='basic_left'>G\u00f3c t\u1edbi lu\u00f4n lu\u00f4n b\u1eb1ng g\u00f3c kh\u00fac x\u1ea1.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3428},{"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":"M\u1ed9t ng\u01b0\u1eddi nh\u00ecn th\u1ea5y m\u1ed9t vi\u00ean s\u1ecfi d\u01b0\u1edbi \u0111\u00e1y m\u1ed9t ch\u1eadu ch\u01b0a n\u01b0\u1edbc. Th\u00f4ng tin n\u00e0o sau \u0111\u00e2y l\u00e0 sai?","select":["A. Tia s\u00e1ng t\u1eeb vi\u00ean s\u1ecfi \u0111\u1ebfn m\u1eaft truy\u1ec1n theo \u0111\u01b0\u1eddng g\u1ea5p kh\u00fac.","B. Tia s\u00e1ng t\u1eeb vi\u00ean s\u1ecfi \u0111\u1ebfn m\u1eaft truy\u1ec1n theo \u0111\u01b0\u1eddng th\u1eb3ng.","C. \u1ea2nh c\u1ee7a vi\u00ean s\u1ecfi n\u1eb1m tr\u00ean v\u1ecb tr\u00ed th\u1ef1c c\u1ee7a vi\u00ean s\u1ecfi.","D. Tia s\u00e1ng truy\u1ec1n t\u1eeb vi\u00ean s\u1ecfi \u0111\u1ebfn m\u1eaft c\u00f3 g\u00f3c t\u1edbi nh\u1ecf h\u01a1n g\u00f3c kh\u00fac x\u1ea1."],"hint":"","explain":"<span class='basic_left'>Th\u00f4ng tin sai l\u00e0: \u1ea3nh c\u1ee7a vi\u00ean s\u1ecfi n\u1eb1m tr\u00ean v\u1ecb tr\u00ed th\u1ef1c c\u1ee7a vi\u00ean s\u1ecfi. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3429},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"X\u00e9t m\u1ed9t tia s\u00e1ng truy\u1ec1n t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o n\u01b0\u1edbc, i v\u00e0 r l\u00e0 g\u00f3c t\u1edbi v\u00e0 g\u00f3c kh\u00fac x\u1ea1. \u0110i\u1ec1u n\u00e0o sau \u0111\u00e2y l\u00e0 sai?","select":["A. i>r.","B. Khi i t\u0103ng th\u00ec r c\u0169ng t\u0103ng.","C. Khi i t\u0103ng th\u00ec r gi\u1ea3m.","D. Khi i=0 th\u00ec r=0."],"hint":"","explain":"<span class='basic_left'>Khi i t\u0103ng th\u00ec r c\u0169ng t\u0103ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3430}],"lesson":{"save":0,"level":2}}