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Copy of Technology To Overcome The Limitations Of Sight And Hearing
Transcript of Copy of Technology To Overcome The Limitations Of Sight And Hearing
Limitations of sight can be overcome by using appropiate optical devices such as Microscope , Telescope , Periscope and others. The Limitations of Sight :
Optical Illusion -
Sometimes what we see may not appear to be the real thing. This is because the brain cannot interpret accurately what is actually seen by the eye.
Blind Spot -
The blind spot is a point of the retina of the eye that cannot detect any image. Technology to Overcome the Limitationsof Sight and Hearing 1. Microscope Devices to Overcome The Limitations of Hearing The limitations of sight and hearing can be
overcome by using certain devices. Periscope
A periscope is an instrument for observation from a concealed position. In its simplest form it consists of an outer case with mirrors at each end set parallel to each other at a 45-degree angle. Hearing Limitations
Hearing limitation can be overcome by using appropiate hearing aids such as Microphone , Stethoscope , Amplifier and others.The range of frequency of hearing in human is 20 Hz and 20 000 Hz. It was different according to the age of a person. The Limitations of Hearing :
Children have eardrums that are more elastic.
As people age , their hearing deteriorates. Their eardrums become less elastic.
Person exposed to constant loud noise experiences a loss of hearing-range of hearing is smaller than normal people. Instrument to magnify object such as virus.
Objestive lens and eyepiece magnify image.
These early lenses were called magnifiers or burning glasses 2. Telescope
Viewing distand objects :Stars , Planets and Moon.
Consists of two convex lenses :objective and eyepiece lens.
The image produced by the objective lens is magnified by the eyepiece lens.
Most people would say that the main function of a telescope is to make things look larger. But in fact, the most important function is to make things look brighter! This is called its light-gathering power. 1. Microphone
Microphone is an acoustic-to-electric transducer or sensor that converts sound into an electrical signal. Microphones are used in many applications such as telephones, tape recorders, karaoke systems, hearing aids, and others . 2. Stethoscope
Allows medical proffesionals to listen to sounds produced by the lungs, heart and intestines. Any abnormal function within these systems in the body can be immediately spotted with proper use of a stehoscope. 3.Hearing aids The first hearing aid was created in the 17th century. The movement toward modern hearing aids began with the creation of the telephone , and the first electric hearing aid was created in 1898. By 1996, the digital hearing aid was distributed to the public commercially. Some of the first hearing aids were external hearing aids. External hearing aids directed sounds in front of the ear and blocked all other noises. The apparatuses would fit behind or in the ear. As technology grew, both militarily and internally, the hearing aid became more advanced. The creation of carbon microphones , transmitters , digital signal processing chip or DSP , and the development of computer technology helped transform the hearing aid from the cupped hand to its present form.