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एक समतल-उत्तल लेन्स में उत्तल पृष्ठ की वक्रता त्रिज्या 15 सेमी तथा लेन्स की फोकस दूरी 30 सेमी है। लेन्स के पदार्थ का अपवर्तनांक है-

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एक समतल-उत्तल लेन्स में उत्तल पृष्ठ की वक्रता त्रिज्या 15 सेमी तथा लेन्स की फोकस दूरी 30 सेमी है। लेन्स के पदार्थ का अपवर्तनांक है-
A. `1.50`
B. `1.55`
C. `1.30`
D. `1.35`
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