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A convex mirror used on a truck has a focal length of -3 m. If a car is 6 m behind the truck, where is its image?A convex mirror used on a truck has a focal length of -3 m. If a car is 6 m behind the truck, where is its image?A convex mirror used on a truck has a focal length of -3 m. If a car is 6 m behind the truck, where is its image?A convex mirror used on a truck has a focal length of -3 m. If a car is 6 m behind the truck, where is its image?