Lens Calculator
Where does a thin lens form an image of this object? Enter the stated values to calculate this model.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Focal length (m) | Enter focal length in m; use the same basis as the other measurements. |
| Object distance (m) | Enter object distance in m; use the same basis as the other measurements. |
Understanding your result
Read Signed image distance (m), Magnification (1) in the units and model stated on this page. The formula image=1/(1/f-1/object) · magnification=-image/object defines the relationship; measurement accuracy and model applicability are separate from numerical precision.
Common mistakes
- Mixing input units or changing the physical meaning of a variable without changing the model.
Check your calculation
- Use the worked example as a known reference case, then change one input at a time and check the direction and units of the response.
Calculation checks, sources and review limits
Where does a thin lens form an image of this object?
Where does a thin lens form an image of this object? Enter the stated values to calculate this model.
Common uses
- Where does a thin lens form an image of this object
How it works
image=1/(1/f-1/object); magnification=-image/object
Worked example
Enter Focal length: 0.1 m; Object distance: 0.3 m. Results: Signed image distance: 0.15 m; Magnification: -0.5 1.