Physics
A person suffering from long sightedness wears spectacles having a …………… lens and a person suffering from short sightedness wears spectacles having …………… lens.
- convex, convex
- concave, concave
- concave, convex
- convex, concave
Answer
convex, concave
Reason — Long-sighted individuals require convex lenses to converge light rays and focus them properly on the retina for clear vision of nearby objects, while short-sighted individuals require concave lenses to diverge light rays and focus them properly on the retina for clear vision of distant objects.
Related Questions
A simple microscope uses a :
- convex lens of short focal length
- convex lens of large focal length
- concave lens of short focal length
- concave lens of large focal length
A boy has two lenses A and B. When lens A is kept near a printed page, letters appear magnified. When lens B is used to see a distant object, an upright image is seen. The lenses A and B are :
- both are convex
- both are concave
- A ⟶ concave, B ⟶ convex
- A ⟶ convex, B ⟶ concave
What is magnifying glass? State its two uses.