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September 2, 2014

Homework Help: Physics - urgent, please help!

Posted by Juniper on Monday, November 17, 2008 at 11:06pm.

10pm.

I asked

"Show mathematically that to produce an image that is the same size as the object in a concave mirror, the object needs to be at twice the focal length from the mirror."

and bobpursley answered:

"1/o + 1/o=1/f
1/2f + 1/i=1/f
1/i=1/2f
i=2f

M=di/do= 2f/2f= 1

check my thinking."

could someone please explain, I'm not really following.

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