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An object is placed $100\text{ cm}$ in front of a concave mirror, and a real image is formed that is $1/4$ as tall as the object.

Which of the following values is the focal length of this mirror?

A

$20\text{ cm}$

B

$25\text{ cm}$

C

$33\text{ cm}$

D

$400\text{ cm}$

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