NOTE: You need to be using a Java-enabled browser to view this applet
Meterstick Applet

The Meterstick applet will appear to the left in a Java-enabled browser. This applet shows a schematic diagram of the meterstick spectroscope, seen from above.

Your goal is to see how the spectroscope works and to examine the spectra of different elements available in the lab.

Use your mouse to move the eye of the observer until you line it up with an emission line.

Geometry labels and the diffraction equation will appear.

Move the observer to different lines to see how wavelength changes with angle.

Notice how the spectrum on the meterstick changes with the viewing angle.

Use the selector above the diagram to choose a different element.

You can turn on animation of the light path by clicking on the Start Animations button.