An object with a height of 2.5 cm lies 10 cm in front of a lens with a focal length of 6 cm.
a. Using the object-image distance formula, calculate the image distance for this object.
b. What is the magnification of this image?
c. Trace three rays to confirm your conclusions of parts a and b.
d. Suppose that this image serves as the object for a second lens that has a focal length of 4 cm. The second lens is placed 6 cm beyond the image serving as its object. Where is the image formed by this second lens, and what is its magnification? 

e. What is the overall magnification produced by this two lens system