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[ Last edited by wojinjin on 2009-9-10 at 18:48 ]
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bote

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Originally posted by wojinjin at 2009-8-18 15:50:
¶à²ãĤ·´ÉäÂʵļÆËã¹ý³ÌÖУ¬ÔÚµÚÒ»¸ö½çÃæ³öÉäµÄ¹â½øÈëµÚ¶þ¸ö½çÃæÊ±ÓиöÏàλÑÓ³Ù£¬Õâ¸öÏàλÑÓ³ÙÔÚ²»Í¬µÄ¿Î±¾ÉÏÓÐÁ½ÖÖ±íʾ·½·¨£¬Ó¦¸ÃÊÇ˵ÍêÈ«²»Í¬Á½ÖÖ±íÊö·½·¨£¬ÓеÄÊéÉÏÊÇ2*PI/lamata  *n*d*cos(theta), theta ÊÇÕÛ ...

all these two expressions are correct BUT NOT THE SAME.

(using your words)
An incident beam line is divided into two parts, the deflected and refracted, at an interface  between the media #1 and #2. Your expression of 2*PI/lamata  *n*d*cos(theta) is the TOTAL PHASE DIFFERENCE between these two beam lines in the media #1, which includes two parts, the phase lapse of the refracted beam line in media #2 (=2*PI *n*d*/[lamata*cos(theta)]), and the phase lapse of the deflected beam line in media #1 (=2*n*d*tan(theta)*sin(theta)).

Therefore, the expression of 2*PI *n*d*/[lamata*cos(theta)], which you found in some other textbooks, is only a phase lapse of the refracted beam line in media #2.

Sorry for making you confused in my last post.

[ Last edited by bote on 2009-9-13 at 08:22 ]
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