In a double-slit interference experiment designed to calibrate a high-precision slide, a coherent laser of wavelength 540 nm540\text{ nm}540 nm is directed at the double slit. The resulting interference pattern is projected onto a screen placed 1.80 m away. A student measures the total width of 15 adjacent fringe spacings (the distance between the 1st and the 16th bright fringe) to be 1.62 cm.
What is the separation of the two slits?
6.0×10−5 m6.0 \times 10^{-5}\text{ m}6.0×10−5 m
9.0×10−5 m9.0 \times 10^{-5}\text{ m}9.0×10−5 m
9.0×10−4 m9.0 \times 10^{-4}\text{ m}9.0×10−4 m
9.6×10−4 m9.6 \times 10^{-4}\text{ m}9.6×10−4 m
