Question

Fish are able to see under water because

• A. Both lens and cornea are spherical
• B. Cornea is spherical, lens is flat
• C. Cornea is flat, lens is spherical
• D. Both lens and cornea are flat

Answer 1

The correct option is C Cornea is flat, lens is spherical

Things are less visible underwater because there is less illumination. The lights gets scattered and the vision becomes blurred but the eyes of underwater animals are optimised for a clear vision. The lens of eyes in fishes is almost spherical and extremely convex. Their cornea is flat and the refractive index of their lens is very high. Due to this eye lens focusses the light rays on retina to give a clear image. Hence, fishes are able to see underwater.

So, the correct answer is 'Cornea is flat, lens is spherical'.