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দুটি আলোকীয় মাধ্যমের যে কোনো একটির সাপেক্ষে অন্য মাধ্যমের প্রতিসরাঙ্ককে প্রথম মাধ্যম সাপেক্ষে দ্বিতীয় মাধ্যমের প্রতিসরাঙ্ক বা আপেক্ষিক প্রতিসরাঙ্ক বলে।
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দুটি আলোকীয় মাধ্যমের যে কোনো একটির সাপেক্ষে অন্য মাধ্যমের প্রতিসরাঙ্ককে প্রথম মাধ্যম সাপেক্ষে দ্বিতীয় মাধ্যমের প্রতিসরাঙ্ক বা আপেক্ষিক প্রতিসরাঙ্ক বলে।