1. The problem statement, all variables and given/known data Hey everyone, I am doing youngs double slit experiment to find the wavelength of a light source but i am having a lot of trouble finding the independent and dependent variables. Can people suggest what they could be? Thanks. Also, some controlled variables would be helpful aswell. 2. Relevant equations I use d sin (theta) = m * lamda 3. The attempt at a solution We measured the fringe separation to calculate the wavelength, so i said it might be: independent: wavelength of light dependant: fringe separation Controlled: NOW I AM CONFUSED. You see, its supposed to be that the wavelength is constant, and hence the fringe separation is constant. I don't know. Can someone please help?