Lens Equation Calculator (1/f = 1/v + 1/u)
1/f = 1/v − 1/u
Cartesian sign convention: distances positive to right of lens; real objects have u < 0.
About this tool
Lens Equation Calculator (1/f = 1/v + 1/u) is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
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