Mirror M, in the figure below is moved through a displacement AL. During this displacement, 240 fringe reversals (formation of successive dark or bright bands) are counted. The light being used has a wavelength of 634.8 nm. Calculate the displacement AL.
Mirror M, in the figure below is moved through a displacement AL. During this displacement, 240 fringe reversals (formation of successive dark or bright bands) are counted. The light being used has a wavelength of 634.8 nm. Calculate the displacement AL.
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1 and 2 thanks in advance
Transcribed Image Text:Mirror M, in the figure below is moved through a displacement AL. During this displacement, 240 fringe reversals (formation of
successive dark or bright bands) are counted. The light being used has a wavelength of 634.8 nm. Calculate the displacement AL.
um
A single ray of light is
split into two rays by
mirror Mo, which is
called a beam splitter.
Light
source
The path difference between
the two rays is varied with the
adjustable mirror M1.
M1
Telescope
Mo
L2
As Mj is moved, an
interference
M2
pattern changes in
the field of view.
Transcribed Image Text:A material having an index of refraction of 1.30 is used as an antireflective coating on a piece of glass (n = 1.50). What should be
the minimum thickness of this film in order to minimize reflection of 480 nm light?
nm
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