Physics, asked by mefarexo5921, 1 year ago

The far point of a myopic eye is 10 cm from the eye. What must be the focal length of a lens for reading at normal distance

Answers

Answered by ankit9456
4
focal length of lens 25cm
Answered by lidaralbany
25

Answer:

The focal length of a lens for reading at normal distance is 16.67 cm.

Explanation:

Given that,

Distance of the object u = -25 cm

Distance of the image v = -10 cm

Using lens's formula

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

\dfrac{1}{f}=\dfrac{1}{-10}-\dfrac{1}{-25}

\dfrac{1}{f}=\dfrac{-3}{50}

f= \dfrac{-50}{3}

f=-16.67\ cm

Hence, The focal length of a lens for reading at normal distance is 16.67 cm.

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