# Interference - Finding distance between slits

## 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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