Homework Statement
It is desired to magnify reading material by a factor of 3.5× when a book is placed 9.5 cm behind a lens.
What is the power of the lens in diopters?
Homework Equations
1/f = 1/di + 1/do
M = -di/do
P=1/f
The Attempt at a Solution
I set equal the magnification to -di/do and...