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सौर कुकर में किस दर्पण का उपयोग किया जाता है

Asked Nov 28, 2017 Modified Aug 13, 2023 Viewed 0 times

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Gk physics-gk

asked Nov 28, 2017 at 08:14

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अवतल दर्पण

answered Aug 13, 2023 at 19:20

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