Th\u00e0nh ph\u1ed1 B\u1ed3ng Lai tr\u00ean b\u00e1n \u0111\u1ea3o S\u01a1n \u0110\u00f4ng (Trung Qu\u1ed1c) l\u00e0 m\u1ed9t th\u1eafng c\u1ea3nh du l\u1ecbch n\u1ed5i ti\u1ebfng, x\u01b0a nay c\u00f3 t\u00ean g\u1ecdi l\u00e0 B\u1ed3ng Lai Ti\u00ean C\u1ea3nh. \u0110\u00f3 l\u00e0 v\u00ec trong ng\u00e0y h\u00e8 l\u1eb7ng gi\u00f3, \u1edf n\u01a1i \u1ea5y m\u00e0 t\u1ef1a bi\u1ec3n nh\u00ecn ra xa, th\u01b0\u1eddng c\u00f3 th\u1ec3 tr\u00f4ng th\u1ea5y n\u00fai non, thuy\u1ec1n b\u00e8, th\u1ecb t\u1ee9, \u0111\u01b0\u1eddng ph\u1ed1 in b\u00f3ng tr\u00ean b\u1ea7u tr\u1eddi. V\u1ec1 k\u00ec quan n\u00e0y, \u0111\u00e3 c\u00f3 nhi\u1ec1u ghi ch\u00e9p trong l\u1ecbch s\u1eed Trung Qu\u1ed1c. Ng\u01b0\u1eddi x\u01b0a cho r\u1eb1ng \u0111\u00f3 l\u00e0 kh\u00ed c\u1ee7a con giao long trong truy\u1ec1n thuy\u1ebft nh\u1ea3 ra m\u00e0 h\u00ecnh th\u00e0nh.<\/p>\n\n\n\n
Th\u1ef1c ra, nguy\u00ean nh\u00e2n t\u1ea1o th\u00e0nh \u1ea3o \u1ea3nh l\u00e0 do nhi\u1ec7t dung c\u1ee7a n\u01b0\u1edbc bi\u1ec3n r\u1ea5t l\u1edbn, d\u01b0\u1edbi \u00e1nh n\u1eafng M\u1eb7t Tr\u1eddi ch\u00f3i chang, nhi\u1ec7t \u0111\u1ed9 n\u01b0\u1edbc c\u0169ng kh\u00f4ng d\u1ec5 t\u0103ng cao. Khi \u1ea5y, l\u1edbp kh\u00f4ng kh\u00ed tr\u00ean m\u1eb7t bi\u1ec3n xu\u1ea5t hi\u1ec7n hi\u1ec7n t\u01b0\u1ee3ng tr\u00ean \u1ea5m d\u01b0\u1edbi l\u1ea1nh, l\u00e0m cho m\u1eadt \u0111\u1ed9 c\u1ee7a kh\u00f4ng kh\u00ed l\u1edbp tr\u00ean nh\u1ecf, l\u1edbp d\u01b0\u1edbi l\u1edbn. Trong th\u1eddi ti\u1ebft l\u1eb7ng gi\u00f3, l\u1edbp kh\u00f4ng kh\u00ed nh\u01b0 v\u1eady duy tr\u00ec \u0111\u01b0\u1ee3c kh\u00e1 \u1ed5n \u0111\u1ecbnh.<\/p>\n\n\n\n
N\u1ebfu b\u00ean b\u1edd bi\u1ec3n c\u00f3 m\u1ed9t ng\u01b0\u1eddi quan s\u00e1t, \u1edf \u0111i\u1ec3m A tr\u00ean bi\u1ec3n c\u00f3 m\u1ed9t h\u00f2n \u0111\u1ea3o nh\u1ecf. \u00c1nh s\u00e1ng do A ph\u00e1t ra t\u1eeb kh\u00f4ng kh\u00ed l\u1edbp d\u01b0\u1edbi c\u00f3 m\u1eadt \u0111\u1ed9 l\u1edbn (m\u00f4i tr\u01b0\u1eddng d\u00e0y \u0111\u1eb7c c\u1ee7a \u00e1nh s\u00e1ng) chi\u1ebfu l\u00ean ph\u00eda tr\u00ean. Do m\u1eadt \u0111\u1ed9 kh\u00f4ng kh\u00ed d\u1ea7n d\u1ea7n nh\u1ecf \u0111i, cho n\u00ean \u00e1nh s\u00e1ng s\u1ebd d\u1ea7n d\u1ea7n l\u1ec7ch kh\u1ecfi h\u01b0\u1edbng ph\u00e1p tuy\u1ebfn (t\u1ee9c l\u00e0 g\u00f3c kh\u00fac x\u1ea1 t\u0103ng l\u00ean d\u1ea7n d\u1ea7n), \u0111i t\u1edbi tr\u01b0\u1edbc theo m\u1ed9t \u0111\u01b0\u1eddng cong AC. Khi tia s\u00e1ng \u0111\u1ea1t t\u1edbi \u0111i\u1ec3m C, do g\u00f3c t\u1edbi v\u1eeba kh\u00e9o l\u1edbn h\u01a1n g\u00f3c t\u1edbi h\u1ea1n, ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n li\u1ec1n x\u1ea3y ra. Sau khi \u00e1nh s\u00e1ng t\u1eeb \u0111i\u1ec3m C g\u1eadp tr\u1edf l\u1ea1i th\u00ec t\u1eeb kh\u00f4ng kh\u00ed l\u1edbp tr\u00ean c\u00f3 m\u1eadt \u0111\u1ed9 nh\u1ecf \u0111i v\u00e0o kh\u00f4ng kh\u00ed l\u1edbp d\u01b0\u1edbi c\u00f3 m\u1eadt \u0111\u1ed9 l\u1edbn, tia s\u00e1ng s\u1ebd d\u1ea7n d\u1ea7n nh\u00edch g\u1ea7n h\u01b0\u1edbng ph\u00e1p tuy\u1ebfn, \u0111i v\u00e0o m\u1eaft ng\u01b0\u1eddi quan s\u00e1t theo \u0111\u01b0\u1eddng cong CO. C\u00f2n \u1ea3nh c\u1ee7a h\u00f2n \u0111\u1ea3o nh\u1ecf m\u00e0 ng\u01b0\u1eddi quan s\u00e1t tr\u00f4ng th\u1ea5y l\u00e0 \u1edf h\u01b0\u1edbng ti\u1ebfp tuy\u1ebfn c\u1ee7a \u0111\u01b0\u1eddng cong OC t\u1ea1i \u0111i\u1ec3m O. R\u00f5 r\u00e0ng l\u00e0 v\u1ecb tr\u00ed \u1ea3nh A’ so v\u1edbi \u0111\u1ea3o nh\u1ecf A \u0111\u01b0\u1ee3c n\u00e2ng cao r\u1ea5t nhi\u1ec1u. Cho n\u00ean lo\u1ea1i c\u1ea3nh t\u01b0\u1ee3ng huy\u1ec1n \u1ea3o n\u00e0y c\u0169ng g\u1ecdi l\u00e0 \u1ea3o \u1ea3nh b\u00ean tr\u00ean.<\/p>\n\n\n\n
Ngo\u00e0i \u1ea3o \u1ea3nh b\u00ean tr\u00ean th\u1ea5y \u0111\u01b0\u1ee3c b\u00ean b\u1edd bi\u1ec3n ra, c\u00f2n c\u00f3 m\u1ed9t lo\u1ea1i \u1ea3o \u1ea3nh b\u00ean d\u01b0\u1edbi. Lo\u1ea1i \u1ea5y ph\u1ea3i \u1edf trong sa m\u1ea1c m\u1edbi th\u1ea5y \u0111\u01b0\u1ee3c. M\u00f9a h\u00e8 n\u0103m 1798, Napoleon \u0111\u1ec7 nh\u1ea5t \u0111em qu\u00e2n \u0111i x\u00e2m l\u01b0\u1ee3c Ai C\u1eadp, l\u00ednh tr\u00e1ng \u0111ang h\u00e0nh qu\u00e2n trong sa m\u1ea1c th\u01b0\u1eddng tr\u00f4ng th\u1ea5y gi\u1eefa nh\u1eefng \u0111\u1ed3i c\u00e1t xa xa c\u00f3 r\u1eebng c\u00e2y, h\u1ed3 \u0111\u1ea7m, qu\u00e2n \u0111\u1ed9i, c\u1edd qu\u1ea1t l\u00fac \u1ea9n l\u00fac hi\u1ec7n, l\u00e0m cho l\u00f2ng qu\u00e2n th\u1ea5p th\u1ecfm. Napoleon li\u1ec1n m\u1eddi nh\u00e0 to\u00e1n h\u1ecdc Gaspard Monge \u0111i c\u00f9ng \u0111o\u00e0n qu\u00e2n ti\u1ebfn h\u00e0nh nghi\u00ean c\u1ee9u hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y. V\u1ecb h\u1ecdc gi\u1ea3<\/a> v\u1ed1n t\u00e2m \u0111\u1eafc v\u1edbi hi\u1ec7n t\u01b0\u1ee3ng quang h\u1ecdc kh\u00ed quy\u1ec3n n\u00e0y nhanh ch\u00f3ng l\u00e0m r\u00f5 nguy\u00ean nh\u00e2n c\u1ee7a n\u00f3. Do v\u00f9ng sa m\u1ea1c r\u1ea5t kh\u00f4 hanh, kh\u00f4ng kh\u00ed d\u01b0\u1edbi \u00e1nh s\u00e1ng gay g\u1eaft r\u1ea5t d\u1ec5 n\u00f3ng l\u00ean, m\u00e0 kh\u00f4ng kh\u00ed th\u00ec d\u1eabn nhi\u1ec7t k\u00e9m, th\u00e0nh th\u1eed kh\u00f4ng kh\u00ed l\u1edbp d\u01b0\u1edbi do ti\u1ebfp gi\u00e1p m\u1eb7t \u0111\u1ea5t n\u00ean nhi\u1ec7t \u0111\u1ed9 t\u01b0\u01a1ng \u0111\u1ed1i cao, l\u1edbp kh\u00f4ng kh\u00ed c\u00e1ch m\u1eb7t \u0111\u1ea5t v\u00e0i m\u00e9t th\u00ec nhi\u1ec7t \u0111\u1ed9 \u1edf \u0111\u00f3 xu\u1ed1ng th\u1ea5p \u0111i nhi\u1ec1u. Nh\u01b0 v\u1eady, m\u1eadt \u0111\u1ed9 c\u1ee7a l\u1edbp kh\u00f4ng kh\u00ed l\u00e0 b\u00ean tr\u00ean l\u1edbn, b\u00ean d\u01b0\u1edbi nh\u1ecf. N\u1ebfu \u1edf v\u1ecb tr\u00ed A ph\u00eda tr\u01b0\u1edbc ng\u01b0\u1eddi quan s\u00e1t kh\u00e1 xa c\u00f3 m\u1ed9t c\u00e2y to, tia s\u00e1ng m\u00e0 c\u00e1i c\u00e2y \u1edf A chi\u1ebfu xu\u1ed1ng, khi \u0111i v\u00e0o l\u1edbp kh\u00f4ng kh\u00ed b\u00ean d\u01b0\u1edbi, do m\u1eadt \u0111\u1ed9 kh\u00f4ng kh\u00ed \u1edf \u0111\u00f3 t\u01b0\u01a1ng \u0111\u1ed1i nh\u1ecf, tia s\u00e1ng kh\u00fac x\u1ea1 s\u1ebd d\u1ea7n d\u1ea7n l\u1ec7ch kh\u1ecfi h\u01b0\u1edbng ph\u00e1p tuy\u1ebfn, v\u00e0 t\u1ea1i \u0111i\u1ec3m C th\u00ec g\u00f3c t\u1edbi v\u01b0\u1ee3t qu\u00e1 g\u00f3c t\u1edbi h\u1ea1n, x\u1ea3y ra ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n. Tia s\u00e1ng sau khi ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n l\u1ea1i d\u1ea7n d\u1ea7n g\u1eadp nghi\u00eang g\u1ea7n v\u1ec1 h\u01b0\u1edbng ph\u00e1p tuy\u1ebfn, sau c\u00f9ng \u0111i v\u00e0o m\u1eaft ng\u01b0\u1eddi quan s\u00e1t. T\u1eeb h\u00ecnh v\u1ebd c\u00f3 th\u1ec3 th\u1ea5y, \u1ea3nh A’ c\u1ee7a c\u00e2y m\u00e0 ng\u01b0\u1eddi quan s\u00e1t tr\u00f4ng th\u1ea5y \u1edf th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi v\u1ecb tr\u00ed th\u1ef1c t\u1ebf c\u1ee7a c\u00e2y. Cho n\u00ean lo\u1ea1i c\u1ea3nh t\u01b0\u1ee3ng huy\u1ec1n \u1ea3o trong sa m\u1ea1c n\u00e0y c\u0169ng g\u1ecdi l\u00e0 \u1ea3o \u1ea3nh b\u00ean d\u01b0\u1edbi. \u1ea2nh tr\u00f4ng th\u1ea5y trong \u1ea3o \u1ea3nh b\u00ean d\u01b0\u1edbi l\u00e0 \u1ea3nh ng\u01b0\u1ee3c.<\/p>\n\n\n\n T\u1eeb kho\u00e1: \u1ea2o \u1ea3nh; \u1ea2o \u1ea3nh b\u00ean tr\u00ean; \u1ea2o \u1ea3nh b\u00ean d\u01b0\u1edbi; Kh\u00fac x\u1ea1 c\u1ee7a \u00e1nh s\u00e1ng; Ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n \u00e1nh s\u00e1ng.<\/p>\n\n\n\n <\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":" Th\u00e0nh ph\u1ed1 B\u1ed3ng Lai tr\u00ean b\u00e1n \u0111\u1ea3o S\u01a1n \u0110\u00f4ng (Trung Qu\u1ed1c) l\u00e0 m\u1ed9t th\u1eafng c\u1ea3nh du l\u1ecbch n\u1ed5i ti\u1ebfng, x\u01b0a nay c\u00f3 t\u00ean g\u1ecdi l\u00e0 B\u1ed3ng Lai Ti\u00ean C\u1ea3nh. \u0110\u00f3 l\u00e0 v\u00ec trong ng\u00e0y h\u00e8 l\u1eb7ng gi\u00f3, \u1edf n\u01a1i \u1ea5y m\u00e0 t\u1ef1a bi\u1ec3n nh\u00ecn ra xa, th\u01b0\u1eddng c\u00f3 th\u1ec3 tr\u00f4ng th\u1ea5y n\u00fai non, thuy\u1ec1n b\u00e8, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[15,7],"tags":[],"class_list":["post-5802","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5802","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=5802"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5802\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=5802"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=5802"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=5802"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}