The Human Eye and the Colourful World
Himachal Pradesh Board · Class 10 · Science
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Explore the full setWhat is the power of accommodation of the human eye?
Answer
The ability of the eye lens to adjust its focal length to focus objects at different distances clearly on the retina. When ciliary muscles relax, the lens becomes thin (long focal length) for distant …
Why can't you read a book held very close to your eyes?
Answer
The eye lens cannot decrease its focal length below a minimum limit. Objects closer than 25 cm (near point) cannot be focused properly on the retina, causing blurred vision and eye strain. This is why…
A student can see the blackboard clearly when sitting in the front row but struggles to read it from the back. What vision defect does this indicate?
Answer
Myopia (near-sightedness). The student can see nearby objects clearly but distant objects appear blurred because the image forms in front of the retina instead of on it. This occurs due to excessive c…
How is myopia corrected and why does this method work?
Answer
Myopia is corrected using a concave (diverging) lens. The concave lens diverges the light rays before they enter the eye, effectively moving the image backward to form on the retina instead of in fron…
An elderly person holds a newspaper at arm's length to read it. What vision defect does this suggest?
Answer
Hypermetropia (far-sightedness). The person can see distant objects clearly but needs to hold near objects farther away because the image forms behind the retina. This occurs when the eye lens focal l…
How is hypermetropia corrected?
Answer
Hypermetropia is corrected using a convex (converging) lens. The convex lens provides additional converging power to help focus light rays on the retina instead of behind it. This enables clear vision…
Why do people over 40 often need reading glasses?
Answer
Presbyopia occurs due to aging. The ciliary muscles weaken and the eye lens loses flexibility, reducing the power of accommodation. The near point gradually moves away from 25 cm, making it difficult …
What are bifocal lenses and when are they used?
Answer
Bifocal lenses contain both concave and convex lenses in one frame. The upper portion (concave) corrects myopia for distant vision, while the lower portion (convex) corrects hypermetropia for near vis…
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