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আলো সংক্রান্ত কোন সমীকরণটি ভুল?

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

m = \frac{v}{u}

p = \frac{1}{f}

\frac{1}{F} = \frac{1}{f_{1}} + \frac{1}{f_{2}} + . . .

ANS : 2

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