Q. The eye can be regarded as a single refracting surface . The radius of curvature of this surface is equal to that of cornea ($7.8\, mm$ ). This surface separates two media of refractive indices 1 and $1.34$. Calculate the distance from the refracting surface at which a parallel beam of light will come to focus.
Solution:
$\frac{1.34}{V} - \frac{1}{\infty} = \frac{1.34-1}{7.8}$
$ \therefore V= 30.7\, mm$
