The focal length of the objective and of the eye- piece of compound microscope are `f_(0) and f_(e)` respectively. If L is the tube length and d, the least distance of distinct vision, then its angular magnification, when the image is formed at infinity, is

Options

A. a. `(1 - (L)/(f_(0)) ) ((D)/(f_(e)))`
B. b. `(1 + (L)/(f_(0)) ) ((D)/(f_(e)))`
C. c. `(L)/(f_(0)) (1 - (D)/(f_(0)) ) `
D. d. `(L)/(f_(0)) ((D)/(f_(e)) ) `