Thin lens formula (Cartesian) (1/v − 1/u = 1/f)
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1/v − 1/u = 1/f
What each symbol means
| Symbol | What it stands for |
|---|---|
| f | Focal length of thin lens (m) |
| u | Object distance from optical centre (m) |
| v | Image distance from optical centre (m) |
When to use this
Standard JEE / NCERT assumptions unless stated (paraxial, thin lens, coherent YDSE sources, etc.).