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বিভিন্ন মাধ্যমের আলোকীয় ঘনত্ব বিভিন্ন হওয়ায় আপতিত আলোর বেগের বিভিন্নতা দেখা যায় এই কারণে প্রতিসরণ হয়।
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বিভিন্ন মাধ্যমের আলোকীয় ঘনত্ব বিভিন্ন হওয়ায় আপতিত আলোর বেগের বিভিন্নতা দেখা যায় এই কারণে প্রতিসরণ হয়।