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ÇÑ ¸ÅÁú¿¡¼­ ´Ù¸¥ ¸ÅÁú·Î ºûÀÌ ÁøÇàÇÒ ¶§ ÀԻ簢°ú ±¼Àý°¢ »çÀÌÀÇ °ü°è½ÄÀ¸·Î Willebrord Snell(1591-1626)ÀÌ 1921³â°æ ½ÇÇèÀ» ÅëÇÏ¿© ÀÌ ½ÄÀ» ¹ß°ßÇÏ¿´´Ù.

n1*sin¥è1 = n2*sin¥è2

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sin¥è2 = n1*sin¥è1 / n2

¥è2 = arcsin(n1*sin¥è1 / n2)
  = arctan{(n1*sin¥è1 / n2)
    /(-(n1*sin¥è1 / n2) * (n1*sin¥è1 / n2) + 1)^(1/2)}

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*** Âü°í¹®Çå[References] ***

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¥è2 = arctan((n1*sin(¥è1) / n2) / (-(n1*sin(¥è1) / n2) * (n1*sin(¥è1) / n2) + 1)^(1/2))
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