Lens formula

Relates the focal length of a thin lens to the distances of the object and its image from the lens. It is used to locate images formed by converging and diverging lenses in optics problems.

\frac{1}{d_o}+\frac{1}{d_i}=\frac{1}{f}

What the symbols mean

distance from the object to the lens (m)
distance from the image to the lens (m)
focal length of the lens (m)

About this formula

  • FieldPhysics
  • TopicOptics
  • LevelHigh school
  • Also calledlens equation, thin lens equation, thin lens formula, image distance formula, focal length formula for lenses, object image focal length relation
  • SourceWikidata Q351959

Write it in Obsidian

MathLive is a free visual math editor for Obsidian. Run Find a formula, type “lens formula”, and it goes into your note as editable LaTeX. You can also scan formulas from screenshots, PDFs and handwriting.

Related formulas