A particular amphibian has an eye similar to a human eye, including a cornea wit

Question

A particular amphibian has an eye similar to a human eye, including a cornea with index of refraction =1.33, and a lens deeper in with index of refraction = 1.40. There is no nictitating membrane. Assume that this animal sees well under water.
Pick One:
a) if it comes out of the water into the air, it's curved cornea will automatically increase the focusing power of its eye (shorter focal length) if nothing else changes.
b) opposite of answer a above -- focusing power will be decreased (focal length will be longer)

Explanation / Answer

answer a).

In water, there is no light refraction at the corneal surface because the cornea and water have the same index of refraction. Focusing depends on the lens only.

Frogs, which are nearsighted, achieve accommodation via lenticular movement, which is moving the lens backwards and forwards, while humans change the shape of the lens.

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