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Solution: A screen is illuminated by monochromatic light as shown in the figure below. The distance from the slits to the screen is L. Using the small angle approximation ( θ = sin θ = tan θ), what is the wave length if the distance from the central bright region to the third bright fringe is y.

Problem

A screen is illuminated by monochromatic light as shown in the figure below. The distance from the slits to the screen is L. Using the small angle approximation ( θ = sin θ = tan θ), what is the wave length if the distance from the central bright region to the third bright fringe is y.