A single slit of width 0.30 mm is illuminated with monochromatic light (λ = 700 nm). A screen is placed 3.90 m from the slit to observe the fringe pattern. What is the distance from the main principle axis and the fourth dark fringe?
Y = m lambda D/d
Y = (4 x 700 x 10^-9 x 3.9)/(0.3 x 10^-3)
Y = 0.036 m
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