A man suffering from short sight is unable to focus on objects further than 2 metres away from him. In order to correct his vision using a pair of spectacles, state what type of thin lens would be needed, and give an appropriate focal length.
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This solution is about the correction lens to be used by a short sighted man. I have shown how to figure out the type of lens to be used and its focal length. This is a very popular question asked in high school optical physics tests. You will find it helpful to know the technique of solving this type of problems by downloading this solution.