Ray
Tracer Through Lens |

This program traces light rays through selected lenses.

Below you should see the ray trace applet.
Otherwise reconfigure your browser.

**Background -- How it works**

- Mark the point being imaged with a dot on your figure. Using a color that approximates the wavelength you're using would be a nice touch.
- Draw the lens surfaces being simulated (at least 2 surfaces, each either a section of a circle or a plane)
- Repeat the following for a sufficient number of rays to illustrate the point without making the diagram too cluttered.
- Draw a line from the point being imaged to the first surface.
- Work out the new direction of the line from the diffraction equations and draw the line to the second surface
- Work out the new direction and draw a line for a sufficient distance beyond the lens to illustrate the point.