Pat'sBlog
The mathematical (and other) thoughts of a (now retired) math teacher,
Showing posts with label
camera obscura
.
Show all posts
Showing posts with label
camera obscura
.
Show all posts
Tuesday, 3 March 2009
Tiny Circles
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Just reviewing a note about the wonderful property of pinholes. If you are in a well lighted room, look at a sign or picture far across the...
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