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Old Sep 18th 2008, 08:32 PM   #1
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No parallax method

What is the meaning of this method if I were to use this in determining focal length of a concave mirror?
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Old Sep 19th 2008, 07:52 PM   #2
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let me answer it myself. No parallax method means that object and image lies on the same vertical plane so that when you move your head left and right, there would be no parallax. If you succeed, then focal length would be half the distance between object and the concave mirror.
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Old Sep 19th 2008, 08:11 PM   #3
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Looks good to me.

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