Constructive inteference question

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The discussion revolves around a homework problem involving two coherent light sources and their constructive interference at a detector. The distances from the sources to the detector are 1.50000 mm and 1.50660 mm, leading to a path difference of 0.00660 mm. The equation v∆L = mλ is used to determine possible wavelengths for visible light. The participant initially considers 660 nm, 600 nm, and 300 nm as potential solutions but realizes not all are valid for visible light. The correct wavelengths must be within the visible spectrum, which excludes some of the initially considered options.
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Homework Statement


Two sources produce coherent light waves that come together at a detector located 1.50000 mm from one source and 1.50660 mm from the other. If the two waves interfere constructively, what is(are) a possible value(s) for the wavelength? Assume the light is visible light. (Select all that apply.)

629 nm 660 nm 600 nm 535 nm 300 nm

Homework Equations


(presumably)v∆L= mλ

The Attempt at a Solution


I figured ∆L/λ gave integers for 660nm, 600nm, and 300nm, but apparently those aren't the right answers
 
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Not all of those wavelengths lie in the range for visible light.
 
OK, got it. Thanks!
 
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