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An object at a certain height in the positive y axis is placed at a distance...

An object at a certain height in the positive y axis is placed at a distance D from a screen. We see that a thin lens can form a real image of the object onto the screen when it is placed at two different positions between the screen and the object. These two positions are separated by a distance d.

a) Give the ratios h1/h2 between the heights h1 and h2 of the two images on the screen, as a function of D and d.

b) the height of the object as a function of h1 and h2

c) the focal length f of the lens

d) the minimum possible value of D as a function of f

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