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

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Focal length of eye lens

Object distance from eye lens

The radii of curvature of eye lens

Image distance from eye lens

answer is D.

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Detailed Solution

When we see objects at different object distances, the radius of eye lens changes which in turn changes the focal length.

The image is always formed on the retina and the distance between eye lens and retina is constant i.e., 2.5 cm. Therefore, the image distance from the eye lens remains constant. Hence answer is option D.

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