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NDA 1 2024 GAT, question 128

Topic: Physics

Q128

For a human eye, where uu is the distance of an object from the eye, ff is the focal length of the lens and vv is the distance of image from the eye, which is the correct schematic graph ?

  1. (a) Option (a)
  2. (b) Option (b)
  3. (c) Option (c)Correct answer
  4. (d) Option (d)

Solution.

Answer: (c) Option (c)

  1. The eye’s image distance v is approximately fixed by the retina.
  2. Using positive distance magnitudes, 1/f = 1/u + 1/v gives f = uv/(u + v).
  3. As u increases, f rises toward the limiting value v with decreasing slope.
  4. Graph (c), with f vertical and u horizontal, has this shape.