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Statement of a problem № 3993

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An object is placed at a fixed distance D from the screen. Real images of the object are formed on the screen for two positions of a lens, separated by a distance d . Show that (a) the ratio between the sizes of the two images will be (D-d)^2/(D+d)^2; (b) The object size = sqrt(I1·I2), where I1 and I2 are the sizes of the images; (c) f = (D^2-d^2)/4D; (d) D > 4f

Solution:
An object is placed at a fixed distance D from the screen. Real images of the ob

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