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T 18 Lp C Khi Y10Bi tp Vt l L sinh 2 Page 1Kawachi Takayuki BI TP GIAO THOA NH SNG Mt ngun sng n sc pht ra nh sng c bc sng =0,6m. chiu nh sng trn vo 2 khe h hp song song cch nhau a=1mm v cch u ngun sng. Trn mt mn nh t song song v cch mt phng cha 2 khe mt on D=1m ta thu c mt h thng vn giao thoa. a.Tnh khong vn i nu ton h thng t trong khng kh. b.Xc nh v tr 3 vn ti u tin. c.t trc 1 trong 2 khe mt bn mng phng, trong sut c 2 mt song song, dy e=12m v chit sut n=1,5. Khi h vn c g thay i? xc nh dch chuyn. d.Nukhngtbnmngmvokhonggiamnnhv2khemtchtlngth ngi ta thy b rng ca mi khoang vn by gi l i=0,45mm. Tnh chit sut ca cht lng. Gii a.Do ton h thng t trong ko kh nn hiu quang l = d2 d1 Do a sin = k.( /b) vi k = 1, 2, ... => = 6.Chiu mt chm tia sng song song n sc vo mt khe hp. Bc sng ca as ti bng 1/6 b rng ca khe. Hi cc tiu nx th ba dc quan st vi gc lch bao nhiu ? Gii : Ta c : Cc tiu nx th ba => 01 1sin 3. 3. 306 2 bm m = = = = 7.Chiu1chmtiasng//nsc=4358,34vunggcvi1cchttruynqua.Tmgc lch ng vi vch quang ph th 3 bit rng trn 1mm ca cch t c 500 vch. Gii : Cng thc : d.sin = k. (d : chu k cch t) Theo bi => d = (1.10^-3)/500 = 2.10^-6 ng vi vch quang ph th 3 => 10063.4358, 34.10sin 40 49'2.10m m= = Cc tiu:sin . kbm =vi k = 1, 2, ... Cc i: 1sin ( ).2kbm = + vi k = 1, 2, 3,... T 18 Lp C Khi Y10Bi tp Vt l L sinh 2 Page 4Kawachi Takayuki 8.Vch quang ph ng vi bc sng =0,5461m trong quang ph bc 1 ca hi thu ngn dc quan st vi gc =1908. Hi s vch trn 1mm ca cch t. Gii : 60. 1.0, 5461.10 1600sin sin19 8'kd ndm= = = = 9.Mt chm tia sng dc ri vung gc vi 1 cch t. Bit rng gc nhiu x i vi vch quang ph 1 = 0,65m trong quang ph bc 2 bng 1 = 450. Xc nh gc nx ng vi vch quang ph = 0,50m trong quang ph bc 3. Gii : Ta c : 1 11 1 110 011 11 11..sin .sin. . . 3.0, 5.sin . sin .sin sin45 54 40'.. 2.0, 65sinkd k dk k kd kkd km m m m m mm= == = = = = =