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Old Dec 5th 2018, 11:15 AM   #1
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Find the opening size

A yellow He-Ne laser with λ = 594 nm is lighting on a circular opening. There's a screen 5.0 m away with a bending pattern. The fifth dark ring (starting from centrum) has the diameter 10.5 cm. Determine the size of the circular opening.

I think that I might need to use the formula D*sin(x) = k*λ to solve for D, but other than that I'm unsure how to go about.

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