An object is placed 20 cm to the left of a converging lens, Ask an Expert

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An object is placed 20 cm to the left of a converging lens with a focal length of 8 cm. A second converging lens of focal lenght 12 cm is placed to the right of the first lens. If the final image of the combined lens system is virtual and 15 cm from the second lens, then calculate the distance between the two lenses.

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