An optical system consists of two lenses separated by 35 cm – first is converging with focal length 10 cm and the second is diverging with focal length 15 cm. An object is 20 cm to the left of the first lens. Find the position of the final image using both a ray diagram and the thin-lens equation. Is the image real or virtual? Erect or inverted? What is the overall magnification of the image?
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