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On 05/25/2010 04:58 AM, Anthony Lapinski wrote:
For my optics unit I am planning to do some lens combination problems in
my honors classes. Our textbook (Cutnell & Johnson) has typical, standard
problems. I am looking for more practical ones (involving actual devices)
for my students to try. For example, a telephoto lens basically consists
of a positive and negative lens combination.
That basically describes a Barlow lens
http://en.wikipedia.org/wiki/Barlow_lens
These things are commonly used in the amateur telescope community.
Ask around locally. It should be easy to lay hands on examples.
It is straightforward to find the design equations:
http://www.google.com/search?q=%22barlow+lens%22+equations
Example:
http://www.astunit.com/tutorials/barlow.htm
=========================
If you want something very real and very important, but involving
deeper physics than the above, consider compound lenses, such as
achromatic lenses
http://en.wikipedia.org/wiki/Lens_%28optics%29#Compound_lenses
http://en.wikipedia.org/wiki/Apochromat
To find the design equations:
http://www.google.com/search?q=achromat+"v-number"
http://www.google.com/search?q=achromat+"v-number"+site:.edu
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