Multiple choice

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

  1. The focal length of the eye lens

  2. The object distance from the eye lens

  3. The radii of curvature of the eye lens

  4. The image distance from the eye lens
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D Correct answer
Explanation

In the human eye, the distance between the lens and the retina is fixed. To focus on objects at varying distances, the ciliary muscles change the focal length of the lens (accommodation), but the image distance (v) always remains constant as the image must fall on the retina.

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