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Principle

A measurement cuvette set in the beam path of a Michelson interferometer can be evacuated or filled with CO2. The refraction indexes of air or CO2 are determined through the assessed modification of the interference pattern.

Benefits

• see that even two transparent gases can have different optical properties
• a Michelson interferometer is used to measure subtle differences in the refractive indices
• thoughtful engineered components allow effective experimenting

Tasks

1.  Determine the refraction index of air,

2. Determine the refraction index of CO2.

What you can learn about

• Interference
• Wavelength
• Phase
• Refraction index
• Light velocity
• Virtual light source