Why is a normal eye not able to see clearly the objects placed closer than 25cm?
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The normal eye is not able to see clearly the objects placed closer than 25cm because all the power of accomodation of the eye is exhausted at a distance of 25cm. The maximum accomodation of the eye is reached when the object is placed at 25cm fro the eye. After this the ciliary muscles cannot make the eye-lens more thick.
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