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আলোকরশ্মি ঘন মাধ্যমে সংকট কোণের থেকে বেশি কোণে আপতিত হলে তা দুটি মাধ্যমের বিভেদতল থেকে সম্পূর্ণ প্রতিফলিত হয়ে ঘন মাধ্যমে ফিরে আসে একে অভ্যন্তরীণ পূর্ণ প্রতিফলন বলে।
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আলোকরশ্মি ঘন মাধ্যমে সংকট কোণের থেকে বেশি কোণে আপতিত হলে তা দুটি মাধ্যমের বিভেদতল থেকে সম্পূর্ণ প্রতিফলিত হয়ে ঘন মাধ্যমে ফিরে আসে একে অভ্যন্তরীণ পূর্ণ প্রতিফলন বলে।