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काँच (अपवर्तनांक = 1.5 ) के एक उत्तल लेन्स की प्रत्येक पृष्ठ की वक्रता-त्रिज्या 20 सेमी है | 1.75 अपवर्तनांक के द्रव में डुबाने पर इसकी फोकस-दूरी तथा

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काँच (अपवर्तनांक = 1.5 ) के एक उत्तल लेन्स की प्रत्येक पृष्ठ की वक्रता-त्रिज्या 20 सेमी है | 1.75 अपवर्तनांक के द्रव में डुबाने पर इसकी फोकस-दूरी तथा प्रकृति ज्ञात कीजिए |
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Correct Answer - -70 सेमी, अवतल |
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