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শূন্যমাধ্যম সাপেক্ষে যে কোনো আলোকীয় মাধ্যমের প্রতিসরাঙ্ককে ঐ মাধ্যমের পরম প্রতিসরাঙ্ক বলে। যেহেতু প্রতিসরাঙ্ক দুটি সমজাতীয় রাশির অনুপাত, সেজন্য ইহা একক-বিহীন একটি রাশি।
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শূন্যমাধ্যম সাপেক্ষে যে কোনো আলোকীয় মাধ্যমের প্রতিসরাঙ্ককে ঐ মাধ্যমের পরম প্রতিসরাঙ্ক বলে। যেহেতু প্রতিসরাঙ্ক দুটি সমজাতীয় রাশির অনুপাত, সেজন্য ইহা একক-বিহীন একটি রাশি।