A set of parallel slits for optical interference can be made by holding two razo

Question

A set of parallel slits for optical interference can be made by holding two razor blades together and scratching a pair of lines on a glass microscope slide that has been painted black. When monochromatic light strikes these slits at normal incidence, an interference pattern is formed on a distant screen. The thickness of each razor blade used to make the slits is 0.230mm, and the screen is 2.50m from the slits. If the center-to-center separation of the fringes is 7.15mm, what is the wavelength of the light?
The answer should be 658 nm but I don't know how to get it.

Explanation / Answer

Why on earth do you use the thickness of the blade as Y?????? Please help me understand?

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