The Braille system, used by visually impaired people for reading, was developed by:
ALouis Braille
BEdward Jenner
CGalileo Galilei
DHelen Keller
Answer & Solution
Correct answer: A. Louis Braille
Louis Braille, himself visually impaired from a young age, developed the dot-based Braille system and published it in 1821. Letters and characters are formed by raised dots arranged in a 2 × 3 grid, read by touch.
Related questions
Which property of a concave mirror makes it suitable for a dentist?A ray travelling parallel to the principal axis of a concave mirror is reflected:Where must an object sit for a concave mirror to form a virtual, magnified, erect image?What quantity is measured in lux and describes how many lumens fall on each square metre oFor yellow light with a wavelength of 6.00 x 10^-7 m, what frequency does c equals f timesOne light year is the distance light travels in one year. What is that distance in kilometA photographer measures 39.8 lux from a 2,000 lumen bulb held 2.00 m away, using illuminanPolarized sunglasses cut down glare from a lake. How do the lenses achieve this?