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NEET 2013 Physics question

PhysicsRay Optics and Optical InstrumentsNEET 2013

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 -

Answer: (3)

Solution

For a normal relaxed eye focused on a distant object (object at infinity), the cornea and the eye lens together must form the image on the retina. Their powers add: D. Using the lens formula with : \dfrac{1}{f}$ =

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Question ID VK-091334