A normal eye is not able to see objects closer than 25 cm
because
(a) the focal length of the eye is 25 cm
(b) the distance of the retina from the eye-lens is 25 cm
(c) the eye is not able to decrease the distance between
the eye-lens and the retina beyond a limit
(d) the eye is not able to decrease the focal length beyond a limit
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Why is a normal eye not able to see clearly the objects placed closer than 25 cm? Answer: The rays coming from the objects which are at a distance less than 25cm are not properly focussed at retina because ciliary muscles cannot be contracted beyond this limit. The focal length of the eye cannot be reduced below 25cm.
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