Lens Equation Calculator
Find image distance and magnification for a thin lens. The result updates as you type, with the working underneath so you can check it.
Your details
Result
Image distance
15 cm
- Magnification
- -0.5
- Image type
- Real, inverted
Good to know: 1/f = 1/dₒ + 1/dᵢ
Please note: For study and planning. Check calculations independently before using results with chemicals, electricity, pressure or machinery, and follow safety data sheets, manufacturer instructions and local regulations.
About this tool
Formula
1/f = 1/dₒ + 1/dᵢ
Questions people ask
What does a negative image distance mean?
The image is virtual: it appears on the same side as the object and cannot be projected onto a screen.
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How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it.
Spotted a mistake? Tell us and we'll check it. How we check our calculators