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Re: [Phys-l] refraction lab

BC,
Thanks for the resources. Odds are up that we will add a couple of days of 'make' optics next year.

It appears I need to BC / JD course in googleing. I've searched in the past, but my experience here is so limited that I couldn't determine the terms on which I needed to go 'negative Bolean'.

Thanks again.

Paul Lulai
Physics Teacher
US First Robotics Teacher
..:: Medtronic - St Anthony RoboHuskie 2574 ::..
Science Olympiad Coach
St. Anthony Village Senior High
Saint Anthony Village, MN
55418
(w) 612-706-1144
(fax) 612-706-1020
plulai@stanthony.k12.mn.us
http://www.robohuskie.com <http://www.robohuskie.com/>
http://prettygoodphysics.wikispaces.com <http://prettygoodphysics.wikispaces.com/>
http://go4st8physics.wordpress.com <http://go4st8physics.wordpress.com/>
http://www.stanthony.k12.mn.us/hsscience/ <http://www.stanthony.k12.mn.us/hsscience/>



________________________________

From: phys-l-bounces@carnot.physics.buffalo.edu on behalf of Bernard Cleyet
Sent: Tue 4/29/2008 1:47 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] refraction lab



You probably want to use speculum which is softer than most and has
high reflectivity.

http://en.wikipedia.org/wiki/Speculum_metal

I discover one may purchase concave blanks:


http://www.classicscience.com/speculum/speculum_metal1.html



One must use several "pastes" starting w/ what? 80 grit and ending up
w/ several hundred before polishing w/ cerium or rough. At least
that's what I did when I ground glass blanks for telescopes.

On further googling I discovered detailed instructions for this
nearly dead technology*.

http://www.europa.com/~telscope/mudge.txt


* Not so w/ glass. I recently attended a SoCal Physics Technicians
meeting at El Camino College. One large room is dedicated to
grinding and figuring mirrors,. including several sophisticated
Foucault testers.

Here's a list:

http://stellafane.org/tm/mc/other.html


bc wonders if Edmund still sells telescope making kits.



On 2008, Apr 28, , at 19:09, Paul Lulai wrote:

A fairly common method- use knox gelatin and jello molds. cut the
lens, use it, eat it later.
I've wanted to do a 'build optics' day.
I've done the gelatin molds. The one I am missing is mirrors.
I've read (Dr. Falco of Arizona University) that one can make
mirrors by using two bars of metal and a paste btn the surfaces.
Continued rubbing will make one side concave, the other convex. I
don't know where to get the appropriate pastes.

Have a good one.


Paul Lulai
Physics Teacher
US First Robotics Teacher
..:: Medtronic - St Anthony RoboHuskie 2574 ::..
Science Olympiad Coach
St. Anthony Village Senior High
Saint Anthony Village, MN
55418
(w) 612-706-1144
(fax) 612-706-1020
plulai@stanthony.k12.mn.us
http://www.robohuskie.com <http://www.robohuskie.com/> <http://www.robohuskie.com/>
http://prettygoodphysics.wikispaces.com <http://prettygoodphysics.wikispaces.com/> <http://
prettygoodphysics.wikispaces.com/>
http://go4st8physics.wordpress.com <http://go4st8physics.wordpress.com/> <http://
go4st8physics.wordpress.com/>
http://www.stanthony.k12.mn.us/hsscience/ <http://
www.stanthony.k12.mn.us/hsscience/>
_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l


_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l