Equations
Thin lens equation
Optics · id thin_lens
\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i}
| Symbol | Quantity | Unit | Meaning | Usual range |
|---|---|---|---|---|
f | focal length | m | Focal length of the lens | 0.0001 to 100 |
do | object distance | m | Distance from the object to the lens | 0.0001 to 1e+06 |
di | image distance | m | Distance from the lens to the real image | 0.0001 to 1e+06 |
Assumptions
- Thin lens
- Real object and real image
- Paraxial rays
Valid when
- No extra conditions.
Found by
Questions with these words retrieve this equation: lens, focal length, image, object distance, magnifying glass, camera, projector.
Source
OpenStax University Physics Volume 3, Chapter 2 (reference; entry written by the project). License: MIT. Entry confidence: 0.98.