²¼À¸ñ¶¨ÂÉÊǽᾧѧÖÐÓÃÀ´²â¶¨¾§¸ñ³£ÊýµÄ¹«Ê½¡£´Ó¾§ÌåÒ»¸öÔ×ÓƽÃæ×å¡°·´É䡱»ØÀ´Ò»¶¨²¨³¤µÄXÉäÏߵĽǶȽÒʾÁËÕâЩƽÃæÖ®¼äµÄ¾àÀë¡£ÔÚ²¼À¸ñ·½³ÌÖУ¬£î¦Ë£½2dSin¦È£¬¦ËÊDz¨³¤£¬dÊÇÔ×ÓƽÃæÖ®¼äµÄ¾àÀ룬¦ÈÊÇÕâЩƽÃæ·´ÉäµÄXÉäÏߵĽǶȣ¬µ±£î£½1£¬³ÆΪ1¼¶·´É䣬µ±£î£½2£¬³ÆΪ2¼¶·´É䣬µÈµÈ¡£
²¼À¸ñ¶¨ÂÉBragg¡¯s£¬Law
ä¯ÀÀ