The figure below shows an interferometer for measurements of indices of refraction for gases. S is a slit; a monochromatic wave with 2=589 nm is incident on S; 1 and 2 are two identical tubes filled with air having length l=10cm; D is the diaphragm with two slits. When air in tube 1 is replaced with ammonia, the interference pattern on the screen has moved up by N = 17 fringes. Calculate the index na of refraction of ammonia. The index of refraction of air is n,=1.000277. 1 Sc 2

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The figure below shows an interferometer for measurements of indices of refraction for gases. S is a slit; a
monochromatic wave with 1=589 nm is incident on S; 1 and 2 are two identical tubes filled with air having
length l=10cm; D is the diaphragm with two slits. When air in tube 1 is replaced with ammonia, the
interference pattern on the screen has moved up by N = 17 fringes. Calculate the index na of refraction of
ammonia. The index of refraction of air is n,=1.000277.
1
Sc
2
Transcribed Image Text:The figure below shows an interferometer for measurements of indices of refraction for gases. S is a slit; a monochromatic wave with 1=589 nm is incident on S; 1 and 2 are two identical tubes filled with air having length l=10cm; D is the diaphragm with two slits. When air in tube 1 is replaced with ammonia, the interference pattern on the screen has moved up by N = 17 fringes. Calculate the index na of refraction of ammonia. The index of refraction of air is n,=1.000277. 1 Sc 2
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