An object is 1.0 cm tall and its erect image is 4.0 cm tall. What is the exact magnification?

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An object is 1.0 cm tall and its erect image is 4.0 cm tall. What is the exact magnification?
When using the Lens Equation, a virtual image has a
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Answer:

An objectis 1.0 cm tall its erect image is cm tall. What is the exact magnification?

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