a long sighted person has near point at 50cm find out the focal length power, and nature of the lens to over come this defect. least distance of distinct vision is 25cm.
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Explanation:
Person is suffering from HYPERMETROPIA.
In order to view the image of object located at 25cm at retina
CONVEX(CONVERGING) LENS NEED TO BE USED.
u=-25cm
v=-50cm
1/v-1/u=1/f
on solving
f=50cm
power of lens in air =100/f(cm) =+2D
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