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Calculating magnification for Converging lens....

Discussion in 'MCAT Study Question Q&A' started by johnwandering, May 7, 2012.

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  1. johnwandering

    johnwandering 7+ Year Member

    May 18, 2009
    I am quite confused how to do this, because of sign conventions.

    When an object s is on the left side of the lens, it is designated as positive.
    When an image s' is REAL, it is designated as positive.

    this would bring our magnification to
    m=s'/s, which is a positive value.

    But for converging lens, m should be a negative number.......


    Because h' is inverted, it should be a negative value... making m a negative value as well. But that would make our first equation impossible.

    What's up with this?
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  3. EnginrTheFuture

    EnginrTheFuture 2+ Year Member

    Nov 22, 2011

    There's quite the important negative sign missing in there :p

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