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Topics: Lens, Microscope, Telescope Pages: 4 (819 words) Published: February 27, 2014
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INTRODUCTION
Humans have sight and hearing limitation. Without any devices, our sight and hearing was limited.

Objective
The objective of learning about the limitation of sight and hearing: ●I have learnt that our hearing and sight has limitation. ●I have learnt that we can overcome the limitation of our sight and hearing by using or wearing technology devices. ●The technology devices have make our lives easier.

Limitation Of Sight
Our sense of sight has its limitations. We cannot see objects that are very tiny, such as bacteria, viruses and atoms with our naked eye. We also cannot see the stars and planets tha tare very far from Earth. Limitation of sight is whereby a person is able to see an object, colour, shape until a certain extend. Limitations of sight can be overcome by using appropriate optical devices such as microscope, telescope, periscope and others.

Limitation Of Hearing
We cannot hear all the sounds around us. The range of frequency of hearing in human is from 20 Hz to 20 000 Hz. It is different according to the age of a person. Different people have different limitations of hearing. For example, old people generally cannot hear as well as young people. Our eardrum become less sensitive to sound as we grow older. Limitation of hearing can be overcome by using appropriate hearing aids such as microphone, stethoscope, amplifier and others.

Devices To Overcome The Limitation Of Sight

Devices To Overcome The Limitation Of Hearing
Microscope
A microscope is an instrument used to see objects that are too small for the naked eye. Invented by Zacharias Janssen (1585 - 1632)
The first microscope to be developed was the optical microscope The optical microscope, often referred to as the "light microscope", is a type of microscope which uses visible light and a system of lenses to magnify images of small samples. Optical microscopes are the oldest design of microscope and were possibly invented in their present...
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