Optics

6F30.10: Dispersion curve of a prism (chromatic dispersion)


Description: Using a focused white light souce and a prism, a visible light spectrum is projected.
This is because light rays with diffrent wavelenghts will be refracted at diffrent angles by the prism (chromatic dispersion)
due to the fact that the index of refraction of the prism varies slightly with the wavelength.

Equipment: Setup procedure:
  1. Position in the class so the rainbow is on the screen.
  2. Adjust the slit until a nice pattern is displayed.
Demonstration Procedure:
  1. Turn on the overhead projector.
  2. Note that white light when refracted through a prism creates the dispersion curve seen (rainbow). Note that it is a continuous spectrum.
  3. When finished, turn off the overhead projector.
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