The nearest distance of distinct vision for the grandpa who is suffering from long-sightedness is 75 cm. He wishes to read a book that is held at 25 cm from the eye.
What is the nature lens required?
A
Convex Lens
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B
Plano Concave Lens
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C
Concave Lens
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D
Cylindrical Lens
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Solution
The correct option is A Convex Lens The near-point of gradpa has receeded away. So, he is suffering from Hypermetropia. In such a defect, the image is formed beyond the retina for an object kept at 25 cm. So, the light rays need to be converged. This is achieved by a converging lens, i.e., convex lens.