For a human eye, where u is the distance of an object from the eye, f is the focal length of the lens and v is the distance of image from the eye, which is the <strong>CORRECT</strong> schematic graph?

  1. A.
  2. B.
  3. C.
  4. D.

Correct Answer: A.

Explanation

In a healthy human eye, the image distance v (the distance from the eye lens to the retina) remains constant regardless of the object distance u. The eye accommodates by changing its focal length f. Thus, the graph of v versus u is a horizontal straight line.

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