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Question

চোখ ও লেন্সের মর্ধবতীয় দূরত্ব a হলে বিবর্ধক কাঁচের বিবর্ধন রাশি-

m = 1 - (D-a)f

m = 1 - (D+a)f

m = 1 + (D-a)f

m = 1 - (D-a)f

ANS : 3

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