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When an object 1.15 cm tall is placed 12 cm from a lens, the lens produces...

When an object 1.15 cm tall is placed 12 cm from a lens, the lens produces an upright image of the object that is 5.75 cm tall. What is the focal length of the lens?

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Answer #1

Magnification of a lens is, 5.75 1.15 (-12) Use lens formula, v u 60 -12 f f 60 12 f-15 cm

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