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एक द्विउत्तल लेन्स की वक्रता त्रिज्याये क्रमशः 10 सेमी0 व 20सेमी0 है। इसे
1.76 अपवर्तनांक वाले द्रव मे डुबाने पर फोकस दूरी ज्ञात कीजिए।
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