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OpenStudy (anonymous):
Red light with a wavelength of 660 nm and blue light with a wavelength of 480 nm are beamed at a double slit with a separation of 2x10^-3 mm. The third order maximums for the different colours occur at different spots. What is the angle between the second order maximums? I need help solvong this question. Would I need to use the formula nλ=dsin(theta)?
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OpenStudy (festinger):
Yes; apply that formula for the 2 colours with n=3 and solve for \(\theta\). The difference in \(\theta\) is the answer the question wants.
OpenStudy (anonymous):
thanks! So I got θ=41.3 and θ=28.7. I would take the difference and get 12.6 degrees right?
OpenStudy (festinger):
No, n should be 3, not 2. We are talking about third order maximums.
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