On Sunday, March 24, 2013 at 10:09:26 PM UTC-5, W. eWatson wrote:

I've searched the web for caustics and optics, but mostly see pictures
of them. They seem to have some positive use. In some fashion they seem
to magnify. They seem to be somehow related to critical curves, whatever
they are. Both seem to be helpful in gravitational lensing or in other
areas of optics. How?

have you heard about the 'citizen scientist' mass project SPACEWARPS?

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