Two double-slit experiments use the same light of wavelength 600nm.
Experiment 1: d1=0.25mm, L1=1.2m.
Experiment 2: d2=0.40mm, L2=2.0m.
(a) Calculate the distance from the central maximum to the third bright fringe in Experiment 1.
(b) Determine the numerical ratio of that distance in Experiment 2 to the value found in part (a).
(c) Which experiment produces more closely spaced bright fringes? State your reasoning in one sentence.