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NEET 2013 · Optical Instruments & the Eye

Optical Instruments & the Eye question from NEET 2013

Q47NEET 2013Medium

Optical Instruments & the Eye

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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Answer: (a)

  1. Powers in contact add: P=40+20=60P = 40 + 20 = 60 D.
  2. For a relaxed eye, parallel rays focus on the retina, so retina distance =f= f.
  3. f=160f = \dfrac{1}{60} m =10060= \dfrac{100}{60} cm ≈1.67\approx 1.67 cm.
  4. So the answer is (a) 1.67 cm.
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