Foucault Speed of Light Experiment

S_Flaherty

In my class's set up of Foucault's design of the experiment to measure the speed of light, the light beam passes through a beam splitter but there is only one beam spot in the microscope. I'm confused as to why this is. Can someone help explain it to me?

Spinnor

Isn't that what you want? See figure 1,

http://www.phys.ksu.edu/personal/rpr...eedofLight.pdf