General Science Physics Optics

కింది వాటిలో సరైన దర్పణ సూత్రం ఏది?

1
\(\frac{1}{f} = \frac{1}{v} + \frac{1}{u}\)
2
\(\frac{1}{u} = \frac{1}{f} + \frac{1}{u}\)
3
\(\frac{1}{u} = \frac{1}{f} - \frac{1}{u}\)
4
\(\frac{1}{f} = \frac{1}{v} - \frac{1}{u}\)

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