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A person with myopia can see objects placed at a distance of \(4\) \(m\). If he wants to see objects at a distance of \(20\) \(m\), what should be the focal length and power of the concave lens he must wear?
The position of the image is found by using the formula
By applying the value of \(x\) and \(y\)
The focal length is \(m\)
By applying the known values in the formula, we get
\(P\) \(=\)
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