The eye can be regarded as a single refracting surface. The radius of curvature of this surface is equal to that of the 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.

Step-by-step solution

We know eye lens is convex refracting surface. Use expression for refraction from curved surface μ 1 → Refractive index of medium having incident ray μ 2 → Refractive index of a medium having reflected ray μ 2 v - μ 1 u = μ 2 - μ 1 R 1.34 v - 1 ∞ = 1.34 - 1 7.8 v = 30. 7   mm v = 3.07   cm