Question

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.

Answer 1

f = 0.84 m

Step-by-step 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

`(1)/(f) = (1)/(d_0) + (1)/(d_i)`

`(1)/(f) = (1)/(0.35) + (1)/(-0.6)`

`(1)/(f) = 1.19`

`f = (1)/(1.19)`

f = 0.84 m

The focal length of the lens f = 0.84 m