Power of a lens (P = 1/f (f in metres dioptre))
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P = 1/f (f in metres dioptre)
What each symbol means
| Symbol | What it stands for |
|---|---|
| P | Power of lens (dioptre, D) |
| f | Focal length in metres (m) — P = 1/f only when f is in m |
When to use this
Standard JEE / NCERT assumptions unless stated (paraxial, thin lens, coherent YDSE sources, etc.).