A compound lens is made of two lenses in contact having powers 12 D and 2.5 D. Find the focal length and power of the combination. Also, if the magnification produced by a mirror is 1, what does this mean?
a) The focal length is 10 cm and the power is 8 D. Magnification means object size equals image size.
b) The focal length is 8 cm and the power is 10 D. Magnification means object is at infinity.
c) The focal length is 6 cm and the power is 12 D. Magnification means object is magnified.
d) The focal length is 15 cm and the power is 4 D. Magnification means object is diminished.
