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यदि किसी ऐनक के लेन्सों की शक्ति + 2 डायोप्टर हो‚ तो इसकी फोकस दूरी होगी –

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यदि किसी ऐनक के लेन्सों की शक्ति + 2 डायोप्टर हो‚ तो इसकी फोकस दूरी होगी –






 
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