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We cannot clearly see an object kept at ...

We cannot clearly see an object kept at a distance less than 25 cm from the eye.

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(1) When we try to see a nearby object, the eye lens becomes more rounded and its focal length decreases. Then a clear image of the object is formed on the retina of the eye.
(2) The focal length of the eye lens cannot be decreased beyond some limit. Therefore we cannot clearly see an object kept at a distance less than 25 cm from the eye.
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