Question

How can you describe the focal length of the lens to be used to correct Myopia? Deduce mathematically?

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Answer 1

Answer:

A person with myopia cannot see distant objects distinctly since the far point for that person is nearer than infinity. Such a person may see clearly up to a distance of a few meters. In this condition, the image of a distant object is formed in front of the retina and not at the retina itself. A concave lens of suitable power will bring the image back on to the retina by increasing the focal length and thus the defect is corrected.