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Help me solve this The eye can be regarded as a single refracting surface. The radius of curvature of this surface is equal to that of cornea (7.8mm) . This surface separates two media of refractive indices 1 and 1.34. Calculate the distance from the refr

The eye can be regarded as a single refracting surface. The radius of curvature of this surface is equal to that of cornea (7.8mm) . 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.

 

  • Option 1)

    4.0 \: cm

     

  • Option 2)

    2 \: cm

  • Option 3)

    3.1 \: cm

  • Option 4)

    1.0 \: cm

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Refraction through spherical surface -

\frac{\mu _{2}}{v}-\frac{\mu _{1}}{u}= \frac{\mu _{2}-\mu _{1}}{R}
 

- wherein

u= Object distance

v= image distance

R= Radius of curvature

 

\left ( \frac{1.34}{V} - \frac{1}{\infty } \right ) = \frac{1.34 - 1}{7.8}

V = 30.7mm\approx 3.1cm


Option 1)

4.0 \: cm

 

Option 2)

2 \: cm

Option 3)

3.1 \: cm

Option 4)

1.0 \: cm

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