एक उत्तल लेंस की फोकस दूरी 2

1.	एक उत्तल लेंस की फोकस दूरी 20 सेमी है। इस लेन्स से कितनी दूरी पर कोई वस्तु रखी जाये जिससे कि उसका वस्तु से 2 गुना बड़ा प्रतिबिम्ब बने, जबकि प्रतिबिम्ब वास्तविक हो ?
Answer» ANSWER: i can't UNDERSTAND your LANGUAGE

एक उत्तल लेंस की फोकस दूरी 20 सेमी है। इस लेन्स से कितनी दूरी पर कोई वस्तु रखी जाये जिससे कि उसका वस्तु से 2 गुना बड़ा प्रतिबिम्ब बने, जबकि प्रतिबिम्ब वास्तविक हो ?

Answer»

ANSWER:

i can't UNDERSTAND your LANGUAGE

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