Question

short answer:
1.name the most effective tactual resource used for visually challenged person who developed this system
2.list its important features​

Answer 1

Answer:

1. Louis Braille

2.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.