11. In an experiment using Young's slits, six fringes were found to occupy 3.0 mm when viewed at a distance of 36 cm from the double slits. If the wavelength of the light used is 0.59 μm, calculate the separation of the double slits.
a. 0.49 mm
b. 0.42 mm
c. 0.21 mm
d. 0.11 mm
e. 0.32 mm