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Principle

By dividing up the wave-front of a beam of light at the Fresnel mirror and the Fresnel biprism, interference is produced. The wavelength is determined from the interference patterns.

Benefits

• observe that light plus light can result in darkness
• understand how to make use of the interference effect
• a laser as lightsource allows clear observation

Tasks

Determination of the wavelength of light by interference

1. with Fresnel mirror,
2. with Fresnel biprism.

What you can learn about

• Wavelength
• Phase
• Fresnel biprism
• Fresnel mirror
• Virtual light source