Physics

An object is 30.0 cm to the left of a convex lens with a focal length of +8.0 cm. Calculate the distance from the lens. Would it be upright or inverted?

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  1. Use 1/f=1/di + 1/do
    and
    Magnification M=hi/ho=-di/do
    Use metres throughout
    do=0.30
    f=+0.08 m (converging lens)

    di=1/(1/f-1/do)
    =0.1091 (image distance)

    So image is real (di >0) and on the right-hand (emerging) side of the lens.

    M=-di/do=-0.364
    (image smller, inverted, M<0)

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