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**1. Homework Statement**

If the apparatus for showing Newton's rings is illuminated with light at 6250 A (angstroms), what thickness of film underlies each of the first three light rings?

**2. Homework Equations**

2D (the thickness of the film) equals a multiple of 1/2 of a wavelength

1 angstrom = 1 x 10^-10 wavelength

**3. The Attempt at a Solution**

I can't see how the angstroms connect to the fact that the thickness must be a multiple of 1/2.

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