Question

Draw diagrams showing defects for eye using (i) -1.5D lens and (ii) +2.5 D lens.

Answer 1

Hey dear,

◆ Answer -
(i) -1.5 D lens => Concave lens => Myopia
(ii) +2.5 D lens => Convex lens => Hypermetropia

[Refer to the image attached for diagram of these defects and how they are corrected.]

◆ Myopia -
- It's a refractive error where light focuses in front of, instead of on, the retina.
- Also known as near-sightedness or short-sightedness.
- There is defect in distant vision.
- Myopia is corrected with concave lens (having negative power).

◆ Hypermetropia -
- It's a refractive error where light focuses in behind, instead of on, the retina.
- Also known as hyperopia or long-sightedness.
- There is defect in near vision.
- Hyperopia is corrected with convex lens (having positive power).


Hope it helps...