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Newton's rings with interference filters

Newton's rings with interference filters

Item no.: P2220200

Experiment Type: Teacher Experiment, Laboratory Experiment

Difficulty Expenditure of Time print
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Principle

In a Newton's rings apparatus, monochromatic light interferes in the thin film of air between the slightly convex lens and a plane glass plate. The wavelengths are determined from the radii of the interference rings.

Benefits

  • the color of soap bubbles is based on it: interference in thin films
  • use interference optics to determine most subtle differences
  • elaborate filters make quantitative measurements possible

Tasks

Using the Newton's rings apparatus, to measure the diameter of the rings at different wavelengths and:

  1. to determine the wavelengths for a given radius of curvature of the lens
  2. to determine the radius of curvature at given wavelengths.

What you can learn about

  • Coherent light
  • Phase relationship
  • Path difference
  • Interference in thin films
  • Newton's ring apparatus
Document     Filesize
p2220200e.pdf Experiment guide, English 239.18 KB

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