Draw a diagram to show why distant objects cannot be seen distinctly by a myopic eye. List two reasons due to which this defect of vision may be caused.
A person with a myopic eye cannot see objects clearly beyond a distance of 2 m. Name the type of corrective lens that would be needed to correct the defect of vision and draw a ray diagram to show how the defect gets corrected.
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Defects of vision may be caused by :
- Excessive curvature of cornea
- Elongation of eyeball
Concave lens can be used for its correction....
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Myopia
Explanation:
When a person can read a book that is closer clearly, but is not able to read the bus number located a bit far off, he must be suffering from myopia, also known as nearsightedness. He cannot see distant objects clearly because the lens in his eye lacks the power to converge the rays from distant objects on his retina. The rays tend to converge at a point outside the retina and hence the difficulty in his vision. An external concave lens is used to focus the rays on the retina, thus correcting the problem.
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