Instead of changing the focal length of the lens, the eyes of amphibians work in a different manner: a set of muscles changes the shape of the eye which increases the distance between the front of the eye and the retina. The world's largest frog, the Goliath frog of west Africa, has an eye with a minimum size similar to a human's: 2.5cm. However, unlike a human, where the focal length is also 2.5cm, the focal length of the Goliath frog's eye is given by ffrog below. What is the maximum distance this frog can see? ffrog = 2.121 cm 0 a. 2.121 cm 0 b. 1.147 cm 0 0. 13.991 cm 0 d. 0.471 cm 0 e. The frog can see infinitely far away