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Title: An object is placed 21 cm from a concave lens of focal length 25 cm. What is the Post by: ppk on Feb 17, 2012 An object is placed 21 cm from a concave lens of focal length 25 cm. What is the magnification?
A) -0.54 B) 0.54 C) -0.32 D) -0.22 E) 0.22 Title: Re: An object is placed 21 cm from a concave lens of focal length 25 cm. What is the Post by: walid on Feb 18, 2012 B
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