If a farsighted person has a near point that is 0.600 m from the eye, what is the focal length f2 of the contact lenses that the person would need to be able to read a book held at 0.350 m from the person's eyes? Express your answer in meters.

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wagonbelleville wagonbelleville · Answer 1 · 2019-12-03T09:14:48+01:00

Answer:

f = 0.84 m

Explanation:

given,

near point of the distance from eye(di) = 0.60 m

focal length calculation = ?

distance he can read (d_o)= 0.350 m

now,

Using lens formula

[tex]\dfrac{1}{f} = \dfrac{1}{d_0} + \dfrac{1}{d_i}[/tex]

[tex]\dfrac{1}{f} = \dfrac{1}{0.35} + \dfrac{1}{-0.6}[/tex]

[tex]\dfrac{1}{f} = 1.19[/tex]

[tex] f = \dfrac{1}{1.19}[/tex]

f = 0.84 m

The focal length of the lens f = 0.84 m

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