Lens type
Rays to draw
Image properties
- Image distance (v)
- Magnification (m)
- Nature
1/f = 1/v − 1/u | m = v/u
Distances measured from O; right of lens is positive.
Size comparison
▬ Object AB
▬ Image A′B′
▬ Rule 1
▬ Rule 2
▬ Rule 3
Dashed = virtual / extended
Drag on the diagram (or use the arrow keys when it is focused) to move the object. Scale: 1 cm = 0.9 px.