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Images formed by a converging lens?

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A converging lens has a focal length of 12 cm. What are the image distances for the objects placed at:

p = 9 cm

q =

p= 21

q=

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    1/p     +     1/q     =    1/f

    q= -36 cm

    If the lens equation yields a negative image distance, then the image is a virtual image on the same side of the lens as the object.

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    q =28 cm

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