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Mathematics 51 Online
OpenStudy (anonymous):

What have pinhole cameras been used for?

OpenStudy (anonymous):

Viewing solar eclipses

OpenStudy (anonymous):

any other ideas and where did u get that off of @nbouscal

OpenStudy (anonymous):

I got that from general knowledge, but http://en.wikipedia.org/wiki/Pinhole_camera is a resource for you.

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