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in Physics by (92.4k points)
प्रकाश के दो बिंदु-स्रोतों के बीच की दूरी 30 सेमी है | एक स्त्रोत से 20 सेमी दूर एक उत्तल लेन्स रखने पर दोनों स्त्रोतों के प्रतिबिम्ब एक ही बिंदु पर बनते है | उस उत्तल लेन्स की फोकस-दूरी ज्ञात कीजिए |

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