Try moving the mirror a large amount like 1-2 cm or so. Why do the fringes get closer and closer together? This does not relate to water waves at all. Water waves of the same frequency always have the same gap between interfering waves regardless of the difference of the source path lengths. Also it is possible to get just 1 interference fringe with light. Which is 4 times brighter then the two beams combined. How can this be? Water does not do this either.
@MrFaragh It allows us to relate practical measurements of path difference (a few tenths of a mm) to the really, really small measurements of the wavelengths of light, via the equation dM = (2*dL)/lambda. The number of new bright fringes that appear as you move the mirror a distance dL is inversely proportional to the wavelength.
(Answering 2 month old questions FTW!)
What I wanna know is how you can tell precisely when a fringe has appeared or disappeared.
Try moving the mirror a large amount like 1-2 cm or so. Why do the fringes get closer and closer together? This does not relate to water waves at all. Water waves of the same frequency always have the same gap between interfering waves regardless of the difference of the source path lengths. Also it is possible to get just 1 interference fringe with light. Which is 4 times brighter then the two beams combined. How can this be? Water does not do this either.
1234ToddgMr 3 months ago
hello, what's the purpose of this interferometer ??
MrFaragh 3 months ago
@MrFaragh It allows us to relate practical measurements of path difference (a few tenths of a mm) to the really, really small measurements of the wavelengths of light, via the equation dM = (2*dL)/lambda. The number of new bright fringes that appear as you move the mirror a distance dL is inversely proportional to the wavelength.
(Answering 2 month old questions FTW!)
What I wanna know is how you can tell precisely when a fringe has appeared or disappeared.
IXPrometheusXI 3 weeks ago
do you need any help at something ?
liadon666 9 months ago