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

Question

2 years ago

13

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. View Available Hint(s) f2 = nothing

Physics

1 answer:

Doss [256] · Answer 1 · 2022-07-31T17:59:19+03:00

Doss [256]2 years ago

3 0

Answer:

0.84 cm

Explanation:

u = Object distance = 0.35 cm

v = Image distance = -0.6 cm (near point is considered as image distance and negative due to sign convention)

f = Focal length

From lens equation

$\frac{1}{f_2}=\frac{1}{u}+\frac{1}{v}\\\Rightarrow \frac{1}{f_2}=\frac{1}{0.35}+\frac{1}{-0.6}\\\Rightarrow \frac{1}{f_2}=\frac{25}{21}\\\Rightarrow f_2=\frac{21}{25}=0.84\ cm$

Focal length of the lens is 0.84 cm