Physics: Alice is farsighted and cannot see objects clearly that are closer to her eye than 80.0 cm. what is the refractive power of the contact lenses that will enable her to comfortably see objects at a distance of 25.0 cm from her eyes?

Alice is farsighted and cannot see objects clearly

uberagentkenny

13.03.2022

The refractive power of the contact lenses is 2.75 D

Explanation:

Given that,

Image distance v = -80.0 cm

Object distance u= -25 cm

We need to calculate the refractive power

Using lens's formula

$\dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}$

Where, v = Image distance

u = Object distance

$\dfrac{1}{f}=\dfrac{1}{-80}-\dfrac{1}{-25}$

$\dfrac{1}{f}=\dfrac{11}{400}\ cm^{-1}$

$\dfrac{1}{f}=\dfrac{11}{4}\ m^{-1}$

The refractive power of the contact lenses

$D=\dfrac{1}{f}$

$D=\dfrac{11}{4}$

$D=2.75\ diopters$

Hence, The refractive power of the contact lenses is 2.75 D.

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janighad01

29.08.2021

A=48 CM2

Explanation:

A=9 X 10

A=90 CM2 9-2=7

A=6 X 7

A=42 CM2

A=90-42

A=48CM2

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