A student performing Young's experiment with a single-colour source finds the
distance between the first and the seventh nodal lines to be 6.0 cm. The screen
is located 3.0 m from the two slits. The slit separation is 2.2 x 10^2 nanometres. Calculate
the wavelength of the light.
x/L = wavelength/ d
The Attempt at a Solution
I found a solution online and they made the distance 2.2 x 10^-4 metres instead of 2.2 x 10^-7 if you do the conversion. I think they multiplied by something but i don't know why they would need to.