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Finding Focal Lenght

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Posted by John Smith on October 27, 2002 14:41:21 UTC

First I want to say thanks for the help I've been getting here.

My latest question is,

I'm wanting to find the exact focal length of my mirror. I leaned the mirror against the wall and did the test with a flashlight, piece of paper and tape measure. Will this test give me the exact focal length?

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