Question

When objects at different distances are seen by the eye, which of the following remain 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.

Answer 1

Answer:object distance

Explanation:

Answer 2

When objects at different distances are seen by the eye, the image-distance from the eye-lens remain constant.

Option (d) the image-distance from the eye-lens.

Explanation:

For an object infinite gap, the focal length of the eye corresponds to the fixed distance between the cornea and lens combine to concentrate images on the retina, this is always at a fixed distance.

                                                       (Or)  

At the retina, which is at a fixed distance in the eye, picture is always created. So, when objects are seen by the eye at different distances .The distance between the image and the eye lens remains constant by increasing the curative radius of the eye lens to change the focal length when objects are at different distances, the distance between the objects and the eye lens varies.

Thus, the option(d) is the correct answer.