for the eye we can model the lens as a spherical refractor. the image distance i

Question

for the eye we can model the lens as a spherical refractor. the image distance is set by the length to the retina (si=1.8cm) find the focal length of the eye for an object that is 0.65m from the eye. given the index of refraction for the lens of 1.38, find the radius of the lens for this configuration for the eye we can model the lens as a spherical refractor. the image distance is set by the length to the retina (si=1.8cm) find the focal length of the eye for an object that is 0.65m from the eye. given the index of refraction for the lens of 1.38, find the radius of the lens for this configuration

Explanation / Answer

we use

1/si + 1/so = 1/f

1/1.8 + 1/65 = 1/f

f = 1.75 cm

the radius is:

R = 2f = 3.50 cm

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