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Interference question...
One of the beams of an interferometer, as seen in the figure below, passes through a small glass container containing a cavity D = 1.19 cm deep.
http://capa1.physics.sunysb.edu/CAPA/Pictures/gian2450.gif
When a gas is allowed to slowly fill the container, a total of 209 dark fringes are counted to move past a reference line. The light used has a wavelength of 594 nm. Calculate the index of refraction of the gas, assuming that the interferometer is in vacuum.
??some help
One of the beams of an interferometer, as seen in the figure below, passes through a small glass container containing a cavity D = 1.19 cm deep.
http://capa1.physics.sunysb.edu/CAPA/Pictures/gian2450.gif
When a gas is allowed to slowly fill the container, a total of 209 dark fringes are counted to move past a reference line. The light used has a wavelength of 594 nm. Calculate the index of refraction of the gas, assuming that the interferometer is in vacuum.
??some help
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