Focal length:

$\overline{)\frac{\mathbf{1}}{\mathbf{f}}{\mathbf{=}}{\mathbf{(}}{{\mathbf{\eta}}}_{\mathbf{e}\mathbf{y}\mathbf{e}}{\mathbf{-}}{{\mathbf{\eta}}}_{\mathbf{i}\mathbf{n}\mathbf{c}\mathbf{i}\mathbf{d}\mathbf{e}\mathbf{n}\mathbf{t}}{\mathbf{)}}{\mathbf{(}}\frac{\mathbf{1}}{{\mathbf{R}}_{\mathbf{1}}}{\mathbf{-}}\frac{\mathbf{1}}{{\mathbf{R}}_{\mathbf{2}}}{\mathbf{)}}}$

Increasing the η for 1 in air to 1.33 in water reduces the factor (η_{eye} - η_{incident}). Thus, (1/f) decreases. The power of the lens will decrease. Therefore, the ability to converge light decreases.

The image is formed past the Retina.

Draw a light ray diagram for a human eye submerged in water (index of refraction n_{w} = 1.33) where the lens is unable to bring the object into focus. (see figure 3)

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