Question

4. State the difference between:
(a) myopia and hypermetropia
(b) tactual aids and auditory aids​

Answer 1

Answer:

1. This is caused when the light rays from a far away object falls at a distance just before the retina. this problem can be avoided by using concave lens. Hypermetropia is nothing but long sightedness. Person can see a far object clearly and cannot see a nearby object perfectly.
2. Tactual aids are non-optical sensory aids which involve the use of touch, e.g. Braille system for blind people. Auditory aids are non-optical sensory aids which involve the sense of hearing, e.g. Tape recorders, cassettes for deaf

Answer 2

Answer:

these are the differences