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The Human Eye and Colourful World
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28/08/2021 6:45 pm
Topic starter
A person suffering from eye-defect myopia (short-sightedness) can see clearly only up to a distance of 2 metres. What is the nature and power of lens required to rectify this defect?
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28/08/2021 6:49 pm
The person needs a concave lens to rectify this defect.
Calculation of power of the lens:
Here, far point of myopic eye = 2 m
The object kept at infinity can be seen clearly if the image of this object is formed at 2m.
So, object distance, u = ∞
Image distance, v = 2m
\(\frac{1}{v}\) - \(\frac{1}{u}\) = \(\frac{1}{f}\)
\(\frac{1}{-2}\) - \(\frac{1}{ ∞}\) = \(\frac{1}{f}\)
f = -2m
P = \(\frac{1}{f}\) = \(\frac{1}{-2}\)
= -0.5D
This post was modified 4 years ago 2 times by Shivani siva