Physics
Thin Lens (image distance)
Image distance from focal length and object distance.
Formula
Formula
1f = 1do + 1di
Variables
| Symbol | Definition | Type & range | Units | Role |
|---|---|---|---|---|
| f | focal length | real number (ℝ) | — | input |
| dₒ | object distance | computed result | — | result |
Try it yourself
Interactive calculator
Worked examples
Example 1
Givenfocal length f = 10, object dist dₒ = 30
Result15
Example 2
Givenfocal length f = 5, object dist dₒ = 15
Result7.5