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A) How far from −53.0-mm-focal-length lens must an object be placed if its image is to...

A) How far from −53.0-mm-focal-length lens must an object be placed if its image is to be magnified 2.50× and be virtual? Follow the sign conventions.
[Hint: Consider real objects and virtual objects (formed by some other piece of optics).]

b) How far from −53.0-mm-focal-length lens must an object be placed if its image is to be magnified 2.50× and be real? Follow the sign conventions.
[Hint: Consider real objects and virtual objects (formed by some other piece of optics).]

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Don't forget to put negative sign with answers of part a and b...

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