🚀 go-pugleaf

Hello
I have had great results with the Metrologic speed of light kit.
Students set up a mirror on a tripod with an adjustable mechanism
mounted on top.  They set up a laser and use a beam splitter to send
some light down the hall while reflecting some directly into the sensor
on the apparatus.  The beam down the hall comes back and into the other
photocell on the appartus.  An oscilloscope is used to see the
difference in time between the signals.  This is the weakest part
of the experiment but the results are fairly good.  The longer the hall
the better.  A lens must be used to refocus the beam upon returning from
its long trip.  It works for me and my students.  They do need help
in being careful enough to make it work.
Bob Devantery
Hampton, NH