why is a normal eye not able to see clearly object placed closer than 25cm
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Due to image falling ahead of retina and not on retina the lenses cannot contract and relax and so due to such case normal eye cannot.....
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This phenomenon is called the persistence of vision.
Our eyes contains a convex lens .
The focal length of this convex lens in our eyes is 25 cm .This causes a vitual image to form is we keep objects before 25 cm. Our brain cannot distuinguish between the real and virtual images.
Hence we are unable to see close objects.
hani25:
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