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A real image is four times as far from a lens as is theobject. What is the object distance, measured in focal lengths?...

A real image is four times as far from a lens as is theobject.
What is the object distance, measured in focal lengths? ____from the lens
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Answer #1
is I use o for object distance and    i for image distance then:
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       i = 4o     and        1/f = 1/o + 1/i     so
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       1/f = 1/o   + 1/4o
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      1/f     =   4/4o + 1/4o
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    1/f   =    5 /4o  
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       f =    4 o / 5
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           o = 1.25 f        sothe object distance is   1.25 times the focallength
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