Thin Lens Equation Calculator

Your details

Choose which quantity you want the calculator to find.
Distance from the object to the centre of the lens. Always positive.
cm
Positive = converging lens. Negative = diverging lens.
cm
Used to compute the image height. Leave blank to skip.
cm
Solved valueReal, Inverted image
60

The quantity you asked the calculator to find.

Focal length (f)20
Object distance (do)30
Image distance (di)60
Magnification (M)-2
Magnification (|M|)2
Image height (hi)-10
Image typeReal
Image orientationInverted
Lens scenarioCase 3: f < do < 2f - real, inverted, magnified
Object distance (do)30
Image distance (di)60
Focal length (f)20

Image at 60.00 cm from the lens (real, inverted).

  • The focal length is 20.00 cm, so this is a converging (convex) lens.
  • The image is real and inverted. A real image forms on the opposite side of the lens from the object and can be projected onto a screen.
  • The image is 2.00 times larger than the object (magnified). Because M is negative, it appears flipped.

Next stepScenario context: Case 3: f < do < 2f - real, inverted, magnified. Use the reference table below to see how this case compares with the other four standard converging-lens scenarios.

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