Chapter 28 23) A set of parallel slits for optical interference can be made by h

Question

Chapter 28

23) A set of parallel slits for optical interference can be made by holding two razor blades together (carefully!) 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 .230 mm, and the screen is 2.50 m from the slits. If the center to center separation of the fringes is 7.15 mm, what is the wavelength of the light?

Explanation / Answer

Apply the formula

y = mL/d

7.15 X 10-3 = (1)(2.5)()/(2.3 X 10-4)

= 6.578 X 10-7 m which is 657.8 nm

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