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মাধ্যমের প্রতিসরাঙ্ক বেশি হলে তার মধ্যে আলোর বেগ কম হয়।
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মাধ্যমের প্রতিসরাঙ্ক বেশি হলে তার মধ্যে আলোর বেগ কম হয়।