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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 `20 D`. Using this information, the distance between the retina and the cornea eye lens can be estimated to be

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To observe objects at inifinity, the eye uses its least converging power, `P = 40 + 20 = 60 D`
`:.` Distance between cornea/eye lens and retina `= f=(100)/(P)cm =(100)/(P) cm =(100)/(60) cm =(5)/(3) cm`.
To focus an object at near point `u = -25 cm,v = (5)/(3)cm, f = ?`
From `(1)/(f)=(1)/(v)-(1)/(u)=(3)/(5)+(1)/(25)=(16)/(25, f=(25)/(16) cm, Power P'= (100)/(f)=(100)/(25//16) = 64 D`
Power of eye lens, `P" = 64 - 40 = 24 D`
Hence range of accomodation of eye lens is roughly `20 D to 24 D`.
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