The figure below shows a model eye 10 times the actual size of the human eye. Th

Question

The figure below shows a model eye 10 times the actual size of the human eye. The model is filled with water. A thin glass wall at the front acts like a cornea, forming a spherical surface for the water. The crystalline lens is represented by a thin glass lens immersed in the water.

(a) Find the focal length of the lens necessary to form an image of a distant object on the retina.


(b) Find the focal length of the lens necessary to form a retinal image of an object 52.9 cm in front of the cornea.


(c) With no lens inside the model eye, the lens from part (a) is placed in front of the cornea. Is the image of a distant object now formed on the retina, behind it, or in front of it?

Explanation / Answer

a) f = uv/(u+v) = (5*24)/(5+24)= 4.13 cm.

b) 1/O + 1/i = 1/f            ( O=52.9 i= 24=19 cm )

               => f= 1/ (0.019+0.052)= 14.08 cm

c) if there is no lence then the image will form behind the retina ...

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