A simple model of the human eye ignores its lens entirely. Most of what the eye

Question

A simple model of the human eye ignores its lens entirely. Most of what the eye does to light happens at the outer surface of the transparent cornea. Assume that this surface has a radius of curvature of 7.40 mm and that the eyeball contains just one fluid, with a refractive index of 1.45. Determine the distance from the cornea where a very distant object will be imaged.
mm

The answer above is the approximate distance from the cornea to the retina. Answer the following questions about the image.

Explanation / Answer

The formula of lens making is
n1/xo + n2/xi = (n2 - n1)/R.

For distant objects xo is very large and n1/xo is very small.
n2/xi = (n2 - n1)/R,
xi = n2R/(n2 - n1)

     = (1.45*7.4 mm)/( 1.45 - 1)

      = 23.84 mm.
The image distance is 23.84 mm.
The image is inverted, real and diminished

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