Interference - Finding distance between slits

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To find the spacing between the center of the slits (D), the relationship Δy = λL/D is used, where Δy is the spacing between successive nodes, L is the distance from the slits to the screen, and λ is the wavelength. The slope of the Δy vs. L graph can be equated to λ/D, allowing for the calculation of D if λ is known. The discussion confirms that using the slope in this manner is the correct approach. Understanding the relationship between these variables is crucial for solving the problem. This method effectively connects experimental data with theoretical principles in interference patterns.
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Homework Statement


A laser is shone through a set of slits and onto a screen.
I have a Δy vs. L graph plotted, where Δy is the spacing between successive nodes, and L is the distance from the slits to the screen. I'm supposed to find the spacing between the center of the slits. The value of λ is given.


Homework Equations


Δy = λL/D
y is the spacing between successive nodes
L is the distance from the slits to the screen
D is the spacing between the center of the slits

The Attempt at a Solution


I have the slope, but I don't know where to go from there...
I'm thinking that the slope will be equal to λ/D? and if I know λ, then I can calculate D. Not sure if this is the right way to go though.
 
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mattbonner said:
I'm thinking that the slope will be equal to λ/D? and if I know λ, then I can calculate D.

Yes, that's right.
 

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