Question: (a) Does the path-length difference increase or decrease as you move from one bright fringe of a two-slit experiment to the next bright fringe

(a) Does the path-length difference Δℓ increase or decrease as you move from one bright fringe of a two-slit experiment to the next bright fringe farther out?

(b) What is Δℓ in terms of the wavelength λ of the light?

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