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For a normal eye, the cornea of eye prov...

For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20D.Using theis information, the distance between the retina and the corner,eye lens can be estimated to be

A

5 cm

B

2.5 cm

C

1.67 cm

D

1.5 cm

Text Solution

Verified by Experts

The correct Answer is:
C
(lens + cornea) should form image of distance object at retina Converging power `(40 + 20) D = 60 D`
Using lens equation
`(1)/(v)-(1)/(oo)=(60)/(100)`
`v=(5)/(3)cm=1.67 cm`
So distance between retina and cornea should be 1.67 cm.
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