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काँच `(n = 1.5)` के उत्तल लेन्स के प्रत्येक पृष्ट की वक्रता-त्रिज्या R है | लेन्स को जल `(n = 4//3)` में डूबा कर रखा गया है लेन्स की जल में फोकस-दूरी

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काँच `(n = 1.5)` के उत्तल लेन्स के प्रत्येक पृष्ट की वक्रता-त्रिज्या R है | लेन्स को जल `(n = 4//3)` में डूबा कर रखा गया है लेन्स की जल में फोकस-दूरी है :
A. R
B. `(3)/(2)R`
C. 2 R
D. 4 R.
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Correct Answer - D
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