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লেন্স প্রস্তুতকারকের সমীকরণ কোনটি?

p = \frac{1}{f}

\frac{1}{v} + \frac{1}{v} = \frac{1}{f}

\frac{1}{f} = (μ - 1) (\frac{1}{r_{1}} - \frac{1}{r_{2}})

f = \frac{u v}{u + v}

ANS : 3

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