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A bright object and a viewing screen are separated by a distance of 85.0 cm. At...

A bright object and a viewing screen are separated by a distance of 85.0 cm.

At what distance(s) from the object should a lens of focal length 15.5 cmcm be placed between the object and the screen in order to produce a crisp image on the screen?

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Answer #1

we know, ILI (Lens formula) tot IS.5 85-2 Here f= focal length, vzimage distance, uz object distance If the lens is placed at

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