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如圖所示，等邊三角形AOB為透明柱狀介質(zhì)的橫截面．一束單色光PQ平行于角平分線OM射向OA，在界面OA發(fā)生折射，折射光線平行于OB且恰好射到M點（不考慮反射光線）．則（　?。?p><img width="115" height="105" src="http://tikupic.21cnjy.com/d8/1a/d81ad4473fbaaf5ebb9dc67c68b80cff.png" style="max-width:100%;"></p> </h1> <div id="ggnvcjl" class="exam-s"> <span id="xzrcvdl" class="op-item"><span id="4ddkn9p" class="op-item-nut">A . </span><span id="bkyvudd" class="op-item-meat">透明柱狀介質(zhì)對單色光PQ的折射率為 <img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="fsdwkm4" class="op-item"><span id="p9hq90n" class="op-item-nut">B . </span><span id="4cxjft9" class="op-item-meat">從AMB面的出射光線與入射光線PQ的偏向角60°</span></span> <span id="9dfxjjh" class="op-item"><span id="jxgskep" class="op-item-nut">C . </span><span id="9ekzwaq" class="op-item-meat">保持入射點Q不變，減小入射角度，一直有光線從AMB面射出</span></span> <span id="dfv4iaa" class="op-item"><span id="yifepfu" class="op-item-nut">D . </span><span id="hbnciz4" class="op-item-meat">保持入射光PQ的方向不變，增大入射光的頻率，出射點將在M點下方</span></span> <span id="msawdfh" class="op-item"><span id="qvsczwd" class="op-item-nut">E . </span><span id="bss9j3o" class="op-item-meat">增大入射光PQ的頻率，光在該介質(zhì)中的傳播速度不變</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="kju4i49" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="np4mxgk" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=5449319" width="140px" height="140px" alt=""> <p style="text-align:center;margin-top: 10px">微信掃碼預(yù)覽、分享更方便</p> </div> <div id="zheoz9n" class="analyize-extend JV_question__papers"> <h3 class="extend-mt">使用過本題的試卷</h3> <ul class="extend-mc"> <li> <a 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