Violet light (λ = 400 nm) passing through a diffraction grating for which the slit spacing is 6.0 μm forms a pattern on a screen 1.0 m away from the grating. part a is the fringe located at a linear distance y = 204 mm to the left of the central bright fringe a bright fringe, a dark fringe, or something in between? what is the order of the fringe?

3 order dark fringe

Explanation:

y = Distance from central bright fringe = 204 mm

λ = Wavelength = 400 nm

L = Distance between screen and source = 1 m

d = Slit distance = 6 μm

Order of fringe is 3

So, it is a Dark order fringe

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