पूर्ण आन्तरिक परावर्तन से आप क्या समझते हैं ? इसकी आवश्यक शर्तें लिखिए।

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पूर्ण आन्तरिक परावर्तन से आप क्या समझते हैं ? इसकी आवश्यक शर्तें लिखिए।
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