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Human Eye and Colourful World — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHuman Eye and Colourful World3 Marks
Question
A person is able to see objects clearly only when these are lying at distance between 50cm and 300cm from his eyes.
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Answer

The person is suffering from both myopia and Hypermetropia. The far point of the person is 300cm that’s less than infinity hence myopic.The near point of the person is 50cm that is more than 25cm hence the person is suffering from Hypermetropia.
The person requires bi-focal lenses to increase his range of vision. The upper part of the bi-focal lens is a concave lens which facilitates distant vision while the lower part is a convex lens which provides near vision.

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