A short linear object of length `l` lies along the axis of a concave mirror of focal length `f` at a distance `u` from the pole of the mirror. The size of the image is approximately equal to

Options

A. `l((u-f)/f)^(1//2)`
B. `l((u-f)/f)`
C. `l(f/(u-f))^(1//2)`
D. `(lf)/((u-f))`.