An illuminated arrow (object) forms a real inverted image of itself a distance d = 40 cm, measured along the optic axis of a lens. This means the distance between the object and image is 40 cm. If the image is half the size of the object:
A) What kind of lens must be used to produce the image?
B) How far from the object must the lens be placed?
C) What is the focal length of the lens?