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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 

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a

4.0 cm

b

1 cm

c

3.1 cm

d

2 cm

answer is C.

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Detailed Solution

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Using refraction formula, μ2v−μ1u=μ2−μ1R 
or 1.34f−μ1∞=1.34−17.8=3.478 

f=1.34×783.4=30.7mm≃3.1cm

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