Double Slit Diffraction:Finding Greatest Angle for Minimum

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Zach Hughes
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I'm at wits end. I hate WileyPlus. Part A, B and C are correct. I cannot figure out what Part D is -- all of the answers I am getting are wrong.

Homework Statement



Double Slit Diffraction:Finding Greatest Angle for Minimum


Homework Equations

The Attempt at a Solution


Handwritten worked solution on lined paper showing double-slit diffraction calculations with equations for sin(theta), wavelength and slit spacing, and numerical results with units.
 
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Zach Hughes said:
I'm at wits end. I hate WileyPlus. Part A, B and C are correct. I cannot figure out what Part D is -- all of the answers I am getting are wrong.

Homework Equations

The Attempt at a Solution


Handwritten working on lined paper showing calculations with fractions, trigonometric terms and an equation involving sin and a numerical result, likely a double-slit diffraction solution.

What is the condition for a minimum?