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NDA 1 2024 GAT, question 57

Topic: Physics

Q57

The human eye is like a camera that has a lens with :

  1. (a) fixed focal length and fixed aperture size.
  2. (b) variable focal length and fixed aperture size.
  3. (c) fixed focal length and variable aperture size.
  4. (d) variable focal length and variable aperture size.Correct answer

Solution.

Answer: (d) variable focal length and variable aperture size.

  1. The eye changes lens curvature to vary focal length for accommodation.
  2. The iris changes pupil diameter and therefore the aperture size.
  3. Both are variable.