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Question

If your eye glasses have focal length +60 cm, what is your near point?

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Solution

Given:
f=+60 cm
As f is positive, it is a case of Hypermetropia. We need the object to be at near point of distinct vision for a normal eye i.e, at 25cm.

Let u=25 cm (near point of normal eye)
According to Lens formula:
1f=1v1u
160=1v+125
v=43 cm

Thus near point is 43 cm.

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