일반물리학 2 — Images: Problem 10

10 In Fig. 34-25, a real inverted image $I$ of an object $O$ is formed by a particular lens (not shown); the object-image separation is $d = 50.0\text{ cm}$, measured along the central axis of the lens. The image is just half the size of the object. (a) What kind of lens must be used to produce this image? (b) How far from the object must the lens be placed? (c) What is the focal length of the lens?