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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 20 D. Using this information, the distance between the retina and the cornea-eye lens can be estimated to be –
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 20 D. Using this information, the distance between the retina and the cornea-eye lens can be estimated to be –
Physics | Physics
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 20 D. Using this information, the distance between the retina and the cornea-eye lens can be estimated to be –

Option A 1.5 cm
Option B 5 cm
Option C 2.5 cm
Option D 1.67 cm

Solution: Correct Option D

When we look at infinity, the lens offers minimum power and thus the combination gives 40D + 20D = 60D Distance between the retina and the cornea eye = focal length

f = 1/60 m = 1.67 cm

i

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