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A lens is made up of 3 different transparent media as shown in figure. A point object $O$ is placed on its axis beyond $2 f$. How many real images will be obtained on the other side?

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$3$
Since all three medium will form individual real images at different points on the other side of lens (as object distance is more than $2 f$ )
$\therefore$ Number of real images formed $=3$.
$\therefore$ Number of real images formed $=3$.
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