In a simple microscope, the lens is held at a distance d from the eye and the image is formed at the least distance (D) of distinct vision from the eye. What is the magnifying power of the microscope?

• A. D / f
• B. 1 + (D / f)
• C. 1 + {(D - d) / f }
• D. 1 + {(D + d) / f }