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An object 3.00 mm tall is placed 20.0 cm to the left of a thin lens....

An object 3.00 mm tall is placed 20.0 cm to the left of a thin lens. the image is also to the left of the lens and is 6.00 mm tall. What is the focal length of the lens?

Answer is 40 cm, please show steps on how to get here

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