Re: Ways of measuring refractive index of liquid

Thanks, but I dont think we have the stuff to do this.


"Greg Neill" <gneillREM@xxxxxxxxxxxx> wrote in message
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"Panther" <black@xxxxxxx> wrote in message
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"Sam Wormley" <swormley1@xxxxxxxxx> wrote in message
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Panther wrote:
hi

I need to find an accurate, inexpensive way of measuring the
refrcctvie
index of a liquid in a high school lab.

my teacher suggests using a convex lens in water with a mirror and a
pin,
how does this work? what is it called?

PLEASE HELP.




Sounds overly complex. How about a Laser pointer entering a flat fish
tank?

Measure incident angle and refracted angle with a ruler and
protractor
confirming Snell's law

A little vapor to scatter the beam above water and, similarly, a
slight
amount of milk in the water.

That sounds too simple, I ahve to make a 20 page report on it, so
something
harder is needed. Thanks though.


Back in the dark ages when I went to high school, for this
kind of experiment we had these short, flat, half-moon-
shaped containers; they had a semicircular side and a
flat side.

The container would be filled with the fluid of choice
and a light beam sent through the center of the flat
side at some chosen angle of incidence. The light would
then traverse the fluid and exit from the semi-circular
side. Since the beam traveled from the center of
curvature to the semi-circular side, the angle of
incidence with that side was always 90 degrees. The
light would exit the cell and go on to strike a screen
(also semicircular) a short distance away.

The light sources we had available were not well
collimated, so that the measurements were rather
crude. Today, the substitution of a simple laser
pointer for the light source would allow the screen
to be positioned further away, allowing much greater
amplification of the "signal".

It should be easy enough to fill 20 pages with
details from such a setup, including objectives,
diagrams, math derivations, error analysis, not to
mention the tabulated results from several runs of
several fluids with comparisons to accepted values
of their indexes of refraction.





.

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