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Q:

Is there concentration in the eye? 

  • 1
    By altering the convex of the lens
  • 2
    Back-and-forth speed of the lens
  • 3
    By the front-and-back motion of the retina
  • 4
    By changing the refractive index of the liquid of the eye
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Answer : 3. "By the front-and-back motion of the retina "

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