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# A Michelson interferometer is used to measure the index of refraction of a gas by counting ...

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A Michelson interferometer is used to measure the index of refraction of a gas by counting interference fringes as the gas is slowly leaked into a transparent vessel placed in one arm of the interferometer. The vessel initially contains a vacuum, and as the gas is let in, the number of bright fringes is counted—i.e., the number of times the central region of the screen changes from bright to dark and back to bright. Suppose the index of refraction of the gas is 1.0003. If the wavelength of light used is 560 nm, and the vessel containing the gas is 25 cm long, how many bright fringes will be observed?

133

134

267

2.23 × 105

4.47 × 105

1.78 × 106

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## College Physics

Edition: 5th
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