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**1. The statement, all variables and given/known data**

Hi i'm doing this experiment where we need to find the wavelength of our laser light source. I am unsure what the variables IV and DV would be and the controlled variables? Also how will I make the graph? I'm in AS level so please don't make it too solid for me thanks.

**2. Homework Equations**

so we are to use: w=λD/s where w= fringe spacing D is distance from slit to screen and s is the slit seperation

in the form λ=ws/D

**3. The Attempt at a Solution**

I think the controlled variables are the slit separation, s, the distance, D, but im really unsure on the others.