Question

The distance between an object and its upright image is 20 cm. if the magnification is 0.5, what is the focal length of the lens that is being used to form the image?

Answer 1

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Answer 2

Answer:

$m = \frac{f - v}{f} \\ 0.5 = \frac{f - 20}{f } \\ f = 40$

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Explanation:

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