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Teaching animation: Visualization of the lens equation

The interactive animation represents the geometric relationships described by the lens equation.

Click your mouse to zoom the rectangle in or out.

The animation was originally developed as a offline application for Windows and Macintosh systems and for integration into Microsoft PowerPoint slides. The online version presented here serve as a preview. The exe or app file can be downloaded free of charge from members area.


After the download, the animation can be shown in full screen mode. Integration into PowerPoint is also possible.


The animation contains two areas with the following content:

leftExample of an optical mapping with the most important rays
rightMathematical laws written as formulas

The focal length of the lens and the object height can be freely adjusted via two controls. All elements shown are adjusted in real time.


$f$: Focal length of the lens
$g$: Object distance
$b$: Image distance
$G$: Object height
$B$: Image height


The lens equation (also Newtons equation) is:

$$\frac{1}{f} = \frac{1}{g} + \frac{1}{b}$$

$f$: Focal length of the lens
$g$: Object distance
$b$: image distance

General information

Title:Teaching animation: Visualization of the lens equation
Target group:
  • Teachers and lecturers
  • Independent learners
Platforms (primary):
  • Microsoft® Windows®
  • Microsoft® PowerPoint®
  • Apple® Macintosh®
  • Resizable without the loss of visual clarity
  • No installation required
DocumentsLicensing Information
About Flash Player security

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