One way to determine the index of refraction of a gas is to use an interferometer. As shown below, one of the beams of an interferometer passes through a glass container that has a length of L = 1.8 cm. Initially the glass container is a vacuum. When gas is slowly allowed into the container, a total of 7571 dark fringes move past the reference line. The laser has a wavelength of 687 nm (this is the wavelength when the light from the laser is moving through a vacuum). Laser Mirror Beam Splitter Diffraction Pattern Glass Container Mirror A.) Determine how many wavelengths will fit into the glass container when it is a vacuum. Since the light passes through the container twice, you need to determine how many wavelengths will fit into a glass container that has a length of 2L. number of wavelengths (vacuum) = B.) The number of dark fringes is the difference between the number of wavelengths that fit in the container (length of 2L) when it has gas and the number of wavelengths that fit in the container (length of 2L) when it is a vacuum. Use this knowledge to determine how many wavelengths fit into the container (length of 2L) when it is finished being filled with gas. number of wavelengths (gas) = C.) Determine the index of refraction of the gas at its final density. How can you combine your answers for (A) & (B) to take advantage of the formula derived in the Content section? n =
One way to determine the index of refraction of a gas is to use an interferometer. As shown below, one of the beams of an interferometer passes through a glass container that has a length of L = 1.8 cm. Initially the glass container is a vacuum. When gas is slowly allowed into the container, a total of 7571 dark fringes move past the reference line. The laser has a wavelength of 687 nm (this is the wavelength when the light from the laser is moving through a vacuum). Laser Mirror Beam Splitter Diffraction Pattern Glass Container Mirror A.) Determine how many wavelengths will fit into the glass container when it is a vacuum. Since the light passes through the container twice, you need to determine how many wavelengths will fit into a glass container that has a length of 2L. number of wavelengths (vacuum) = B.) The number of dark fringes is the difference between the number of wavelengths that fit in the container (length of 2L) when it has gas and the number of wavelengths that fit in the container (length of 2L) when it is a vacuum. Use this knowledge to determine how many wavelengths fit into the container (length of 2L) when it is finished being filled with gas. number of wavelengths (gas) = C.) Determine the index of refraction of the gas at its final density. How can you combine your answers for (A) & (B) to take advantage of the formula derived in the Content section? n =
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter27: Wave Optics
Section: Chapter Questions
Problem 56P
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Transcribed Image Text:One way to determine the index of refraction of a gas is to use an interferometer. As shown below, one of the beams of an interferometer passes through a glass container that has a length of L = 1.8 cm. Initially the
glass container is a vacuum. When gas is slowly allowed into the container, a total of 7571 dark fringes move past the reference line. The laser has a wavelength of 687 nm (this is the wavelength when the light from
the laser is moving through a vacuum).
Laser
Mirror
Glass Container
Beam Splitter
Diffraction Pattern
Mirror
A.) Determine how many wavelengths will fit into the glass container when it is a vacuum. Since the
light passes through the container twice, you need to determine how many wavelengths will fit into a
glass container that has a length of 2L.
number of wavelengths (vacuum) =
B.) The number of dark fringes is the difference between the number of wavelengths that fit in the
container (length of 2L) when it has gas and the number of wavelengths that fit in the container
(length of 2L) when it is a vacuum. Use this knowledge to determine how many wavelengths fit into the
container (length of 2L) when it is finished being filled with gas.
number of wavelengths (gas) =
C.) Determine the index of refraction of the gas at its final density. How can you combine your answers
for (A) & (B) to take advantage of the formula derived in the Content section?
n=
4
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