Answer
Choice B.
Work Step by Step
Apply the thin-lens formula. The lens power in diopters is 1/f (when f is measured in m).
$$\frac{1}{s}+\frac{1}{s’}=\frac{1}{f}$$
Here, D is negative, s is positive, and s’ is negative. A larger power |D| means that s’ decreases in magnitude.
The shorter focal length, –15-diopter lens creates an image that is a shorter distance from the frog’s eye, compared to the –9-diopter lens.