A 5cm tall object is placed 18cm in front of a thin concave lens. The lens forms an erect image 2cm high on the same side as the object.
(i) Calculate the linear magnification produced by the lens.
(ii) Determine the position of the image.
(iii) Find the focal length of the lens.
(iv) Determine the power of the lens.
(v) State whether the image is real or virtual, and whether it is enlarged or diminished.