A compound lens is made of two lenses in contact, having powers 12D and 25D. What are the focal length and power of the combination?
(a) Focal length = 37D, Power = 37D
(b) Focal length = 337D, Power = 37D
(c) Focal length = 37D, Power = 337D
(d) Focal length = 37D, Power = 13D
If the magnification produced by a mirror is 1, what does this mean?
(a) The object and the image are of the same size.
(b) The object is twice the size of the image.
(c) The image is twice the size of the object.
(d) The object is three times the size of the image.
