When objects at different distances are seen by the eye,which of the following remains constant?

  • A
    The focal length of the eye lens
  • B
    The object distance from the eye lens
  • C
    The radii of curvature of the eye lens
  • D
    The image distance from the eye lens

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Similar Questions

$A$ student can distinctly see objects up to a distance of $15 \, cm$. He wants to see the blackboard at a distance of $3 \, m$. The focal length and power of the lens used,respectively,will be:

$A$ man cannot see clearly the objects beyond a distance of $20 \, cm$ from his eyes. To see distant objects clearly,he must use which kind of lenses and of what focal length?

The near point of a hypermetropic person is $75\, cm$ from the eye. What is the power of the lens required to enable the person to read clearly a book held at $25\, cm$ from the eye?

For a short-sighted person,the image is formed at

The lens used to correct long-sightedness (hypermetropia) is:

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