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संलग्न चित्र में बिन्दु O पर बने प्रतिबिम्ब को पर्दे पर बनाने के लिये कैसा व किस फोकस-दूरी का लेन्स चाहिए जबकि दूसरे लेन्स को (i) पहले लेन्स से सटा कर रखें, (ii) पहले लेन्स से 10 सेमी दूर O की ओर रखें ?
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(i) 40 सेमी फोकस-दूरी का अवतल लेन्स,
(ii) 15 सेमी फोकस-दूरी का अवतल लेन्स |

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