Question

Name the most effective tactual resource used for visually challenged persons. Who developed this system ?

(b) List its two important features.​

Answer 1

Answer:

The most popular resource for visually challenged persons is Braille. Louis Braille developed this system and published it in 1821.braille is a system that uses combinations of raised dots to spell letters and numbers. braille system helps to the visually challenged persons through braille script consisting of raised dots that allow blind person to read and write.

These dot positions form a rectangle composed of 2 columns with 3 dots in each column. A single dot or any combination of dots may be raised at any of the 6 positions. Counting spaces, in which no dots appear, there are 64 English braille combinations in total.

Explanation:

hope it is correct....

Answer 2

Answer:

The most popular resource for visually challenged person is Braille . Louis Braille develop this system and published it in 1821. Braille kochu spend letters and numbers .Braille you system helps to the visually challenged person through Braille script consisting of resistance that allow a blind person to read and write.

This taught positions from a rectangle composed of two columns with three in each colour. Single dot or any combination of dogs may be raised at any of the six points counting spaces in which not tots appear, there are 64 English Braille combinations and total.