. An object is at a distance of 12 cm from a positive lens (f = 9 cm) and at a distance of 21 cm behind it lies a thin negative lens (f = 18 cm). Determine the location of the image created by this lens system and its nature.
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7. An object is at a distance of 12 cm from a positive lens (f = 9 cm) and at a distance of 21 cm behind it lies a thin negative lens (f = 18 cm). Determine the location of the image created by this lens system and its nature.
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