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**1. Homework Statement**

A mixture of red light (wavelength vacuum = 652 nm) and green light (wavelength vacuum = 477 nm) shines perpendicularly on a soap film (n = 1.333) that has air on either side. What is the minimum nonzero thickness of the film, so that destructive interference removes the latter wavelength from the reflected light?

**2. Homework Equations**

HOW do I do this problem if this is a mixture of light? Do I simply add the wavelength value and if so at what point in the problem are they added??

**3. The Attempt at a Solution**

I used: sin(theta) = m (wavelength/n) and plugged in the value for n=1.333 and but I don't know what to plug in for wavelength.