A student records the positions ym of the first four bright fringes produced by light of wavelength 520 nm on a screen 1.2 m from a double-slit arrangement.
m 1 2 3 4
y (mm) 1.57 3.13 4.72 6.25
Using the data, determine the slit separation.
(a) 0.20mm
(b) 0.40mm
(c) 0.60mm
(d) 0.80mm