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Explain with the help of labelled ray diagram, the defect of vision called myopia and how it is corrected by a lens.
Myopia, also known as near-sightedness or short-sightedness, is a defect of vision in which a person can't see the distant object clearly (appears blurred), though can see the nearby objects clearly. The far point of a myopic eye is less than infinity.
This defect occurs either due to the high converging power of the eye lens, (because of its short focal length). Or, due to the eye-ball being too long, which causes light to focus in front of the retina, instead of directly on the retina. As a result, a person with myopia cannot see these objects clearly
It is corrected by using spectacles containing concave lenses, which should be of such a focal length (or power) that it produces a virtual image of the distant object (lying at infinity) at the far point of the myopic eye. Due to which the eye lens then easily focusses the light rays from the far point to form clear images on the retina.
The following ray diagram explains the defect of vision called myopia, and how it is corrected by a lens.
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