Homework Help: science optics

Posted by lily on Sunday, March 28, 2010 at 3:03pm.

A cosmetic mirror is 50cm from your face and the magnified image of your face is upright. You are told that the focal length of the mirror is 45cm. Explain why this focal length is not possible.
I understand that the image would be magnified and upright...that's about it

science optics - drwls, Sunday, March 28, 2010 at 6:52pm
In this case, the image distance, di, is negative and |di| > do for magnification > 1

1/do + 1/di = 1/do -|1/di| = 1/f

1/50 -1/|di| = 1/45

This is not possible. The 1/|di| term must be positive

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