Question

(a) Explain the following terms used in relation to defects in vision and correction provided by them:
(i) Myopia (ii) Astigmatism (iii) Bifocal lenses (iv) Far-sightedness.
(b) Why is the normal eye unable to focus on an object placed within 10 cm from the eye?

Answer 1

Answer:

1) myopia - Convex lens

2) Astigmatism - spherical cylindrical lens

3) Bifocal lenses - presbyopia is used to currected

4) Far-sightedness - concave lens

The normal eye unable to focus on an object placed within 10 cm from the eye because the the minimum distance for an eye to see is 15cm.

happy learning

mark me as brainliest

Answer 2

Explanation:

A:-

1. A condition in which close objects appear clearly, but far ones don't.
2. A common imperfection in the eye's curvature.
3. Bifocals are eyeglasses with two distinct optical powers.

4. A vision condition in which nearby objects are blurry.

B:-

If an object is placed at a distance of 10 cm (i.e., within the 25 cm distance from the eye lens), then the curvature of the eye lens cannot increase further. Therefore, the focal length of the eye lens does not get adjusted to focus the light rays coming from the object onto the retina.