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An object AB is placed on the principal ...

An object AB is placed on the principal axis of two lenses of equal focal length (f). The lenses are separated by a distance 2f, as shown in the figure. Using ray diagram locate the image formed by each lens and state their nature.

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Let `F_11` and `F_12` be the principal foci of the first lens `L_1`, and `F_21` and `F_22` be the principal foci of the second lens `L_2`. From the construction of the ray diagram it is evident that two images would be formed, A.B. image formed by the first lens which would become the object for the second lens, and A.B., final image formed by the second lens. A.B. - virtual, erect, on the same side as object AB, and magnified. A"B" - real, inverted, diminished (compared to A.B.) and on the far side of the combination of lens.
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