. Animals that spend part of their time in air and part in water have particular
ID: 211601 • Letter: #
Question
. Animals that spend part of their time in air and part in water have particular challenges with vision. Let's consider pinniped eyes. Like most aquatic animals, seals have eyes with spherical lenses. C The very central part of the seal's cornea is found to be nearly flat. When on land, the seal narrows its pupil to a very small slit that coincides with his mostly flat region. Explain why this arrangement would improve its vision on land Part A and B attatched if needed A Suppose that the index of refraction of the cornea and vitreous humor is identical to that of water. If the lens diameter is 24 mm and its focal length is 32 mm calculate the index of refraction of the lens. B When the seal is on land, will it tend to be near-sighted, far-sighted, or will it have good eyesight?Explanation / Answer
A.Given: Lens diameter =24mm and focal length is 32mm
1/f=(n-1)(1/r1-1/r2)
where, f is the focal length, n is the refractive index, r1 is the radius of the lens in air and r2 is the radius of the lens in water
r1 and r2 are the same=12mm
therefore, 1/32=n-1
n=1/32+1
n=33/32=1.03
B. When the seal is on land, its eyesight will be very poor that meansit will be near sighted.
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