the focal length of a lens suggested to a person with myopia is 100 cm find the distance of a near point and power of the lens
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Given - the f= 100 cm
To find- distance of near point =?
Formulae= f= 25d/d-25
Solution - power of lens- p= 100/f, 100/100 = 1D
The focal length of lens f= 25d/d-25
Here d is the nearest point,
= 100 = 25d/d-25
= 4d-100=d
= 3d = 100
= d = 33.3 cm
Therefore the distance pf near point = 33.3 cm.
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