The Human Eye and the Colourful World · Class 10 · CBSE Science
A person cannot see objects distinctly placed beyond 2 m. Which defect of vision is he suffering from and which lens is required to correct it?
Practice question from The Human Eye and the Colourful World (Class 10 · CBSE Science), with the correct answer and a step-by-step solution.
medium · Subjective · Q-55316D
A person cannot see objects distinctly placed beyond 2 m. Which defect of vision is he suffering from and which lens is required to correct it?
Answer: The person is suffering from myopia (near-sightedness), as he can see nearby objects clearly but not distant objects. To correct this defect, a concave (diverging) lens of suitable focal length is required so that the image is formed back on the retina.
Solution
Myopia or near-sightedness means the far point has come closer than infinity. A concave lens diverges incoming light rays so they appear to come from the person's far point, forming a sharp image on the retina.
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