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when a lighted candle is placed at 68 cm to the left of a convex lens...

when a lighted candle is placed at 68 cm to the left of a convex lens of focal length F a real image is formed a distance d on the other side of the lens. When the object is move 32 cm closer to the lens of virtual images formed at a distance d on the side of the lens.

question: calculate the focal length of the convex lens f in cm!

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