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How far from a converging lens with a focal length of 15 cm should an object be placed to produce a real image which is half the size of the object?

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  • Physics -

    M = -1/2 = - di/do
    di = 1/2 do
    1/15 = 1/(0.5 do) + 1/do = 3/do
    do/3 = 15/1
    do = 45 cm

    Old Science Guy gave you this.

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