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In the Figure AB is the principal axis o...

In the Figure AB is the principal axis of an optical element (a lens or a mirror). For position 1, 2 and 3 of a real object, the corresponding position of images are 1', 2' and 3' respectively. Size of image at 3' is largest and that at 1' is smallest. Identify the optical element and indicate its position.

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The correct Answer is:
Concave lens. Lens is to the right of 3'
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