Physics 362. Modern Physics Seminars. Future arguments. · Introduction to Astronomy · The Michelson-Morley Experiment · Consequences of relativity: relativity and time travel, relativity in everyday life · Measuring distances in astronomy and the Hubble law
Modern Physics Seminars
A change in the distance of one of the two mirrors introduces a phase change between the two light beams.
When the mirror is moved by ½ l, the path is change by l and the fringe pattern is moved by one fringe.
Light for M1
Light for M2
L = thickness
n = index of refraction
Number of wavelengths in the block (2 times):Nm=2L/ln=2Ln/l
Number of wavelengths in same distance without block:Na=2L/l=2L/l
Phase change (in terms of wavelengths):DN=Nm -Na=2Ln/l- 2L/l= 2L/l (n-1)
Phase change:DN=2Ln/l- 2L/l= 2L/l (n-1)
The length of an object can be expressed in terms of the wavelength of light!!!
For this experiment A. A. Michelson received the Nobel Price in 1907.
Insert calculation of expected dL