Diffraction of Light (Single Slit)

hairey94
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Homework Statement
What is the order for second bright fringe?
Relevant Equations
The second bright fringe from a 633𝑛𝑚 light source overlaps with the third dark fringe from an unknown light source. Calculate the wavelength of the unknown light source.
My initial guess... Third dark fringe is 2nd order dark fringe and second bright fringe is 1st order bright fringe. Is this the correct guess?
 
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HI,

You are not supposed to guess ! Draw a diffraction pattern (or find one) and use the given info to calculate.
 

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