Sherlock Holmes is using an $8\mathrm{.}90-$cm$-$focal$-$length lens as his magnifying glass.

Part A

To obtain maximum magnification, where must the object be placed $($assume a normal eye$)?$

Express your answer using two significant figures and include the appropriate units.

$d_0=$

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Part B

What will be the magnification?

Express your answer using two significant figures.

$M=$

$$

$$

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