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 an

Question

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.

TestHub · Accepted Answer

We know eye lens is convex refracting surface.

Use expression for refraction from curved surface

$μ_{1} \to$ Refractive index of medium having incident ray

$μ_{2} \to$ Refractive index of a medium having reflected ray

$\frac{μ_{2}}{v} - \frac{μ_{1}}{u} = \frac{μ_{2} - μ_{1}}{R}$

$\frac{1.34}{v} - \frac{1}{\infty} = \frac{1.34 - 1}{7.8}$

$v = 30. 7 mm$

$v = 3.07 cm$

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