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QNEET-2013-Ph-1519: NEET 2013 Physics - Class 12 NEET-2013-Ph-1519 Solution: For a normal eye the cornea of eye provides a converging power…
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 1.67 cm 1.5 cm 5 cm 2.5 cm
Multiple Choice Options
- A 1.67 cm
- B 1.5 cm
- C 5 cm
- D 2.5 cm
Step-by-Step Verified Solution
P cornea = + 40 D
P e = + 20 D
Total power of combination = 40 + 20 = 60 D
Focal length of combination = 1 60 _ 100 cm = 5 3 cm
For minimum converging state of eye lens,
u = - � v = ? f = 5 3
From lens formula,
1 f = 1 v _ 1 u
_ v = 5 3 cm
Distance between retina and cornea-eye lens
= 5 3 cm = 1.67 cm