Lens maker's formula (1/f = (μ−1)(1/R1 − 1/R2))
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1/f = (μ−1)(1/R1 − 1/R2)
What each symbol means
| Symbol | What it stands for |
|---|---|
| f | Focal length of thin lens (m) |
| R_1 | Radius of curvature of first surface (signed, Cartesian) |
| R_2 | Radius of curvature of second surface (signed) |
| \mu | Refractive index of lens material relative to surrounding medium |
When to use this
Standard JEE / NCERT assumptions unless stated (paraxial, thin lens, coherent YDSE sources, etc.).