Biology, 06.12.2020 08:40 mariaaaaa69

एक उत्तल लेंस की दूरी 40 सेंटीमीटर है लेंस की छमता की गणना कीजिए

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एक उत्तल लेंस की दूरी 40 सेंटीमीटर है लेंस की छमता की गणना कीजिए...