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Thomas Young

Thomas Young
Thomas Young (1773-1829)
is a British Physicist, the founder
of light wave theory.
Young was born in Milverton, Somerset,
England in June 13, 1773 and died
in London May 10, 1829, at the age of 56.
Young attended a college in Edinburg
University then he went to Germany
and got degree from Gottingen University
at 23 years old. As a student,
he found out that the shape
of the eye lenses are changed they
become thin or convex,
according to the distance of the object seen.
In 1801, Young conducted an experiment known
Later as Young Experiment.
From this experiment,
Young discovered the law
of light interference.
With his discovery, he
succeeded in proving that light is a wave.


In 1793 he managed to explain the process of accommodation 
of the human eye. 
He said that the lens of the eye changes shape, 
according to the distance the object he saw.
In 1801 he discovered the cause of that state astimagtisma 
eye that causes blurred objects seen. 
It is caused by abnormal eye arch. In the same year he 
discovered the law of interference of light. 
With the discovery he proved that light is a wave. 
In addition, Young assumed that a substance has a tension limit. 
The properties of this strain is called "Young's modulus" of a substance.
Interferometer is a device used for measuring wavelengths
 or wavelength changes with very high accuracy 
by determining the lines of interference (Halliday, p. 715, 1994). 
Previous experiments have been done by 
Thomas Young who designed a method to produce an interference pattern. 
Thomas uses a single beam of light (monochromatic) 
and the narrow gap to the two narrow slits radiating or parallel and closely spaced, 
young cracks can be used to determine the interference pattern. 
After that A.Michelson experiment with the design and the same 
principle as belonging to Young's double slit experiment form, 
first experiment Michelson interferometer is used to prove the existence of the ether, 
but not proven, finally Michelson interferometer is used 
to determine the wavelength of light, and to determine the 
distance very short and to observe the optical properties of the 
medium of light wave interference initially demonstrated by Thomas Young in 1801.
 in Young explained that the diffraction experiments are symptoms 
experienced by the spread of a beam direction of light waves through 
a narrow gap when compared to the size of the wavelength. 
If the beam is diffracted wave passes through two narrow slits that 
when two or more waves that meet or chime in the fields of space will be 
added to each other by following the principle of superposition. 
By using the same source of waves (the same light source) and 
the wavelength is known as well, it can be determined very short 
distance along the optical properties of the medium will be easily observed. 
Another theory proposed by Thomas Young (British scientist in 1801), 
said humans can see color because in the retina of the 
human eye there are three color receptors, each sensitive to red, green, and blue. 
He said that the colors red and blue are the primary colors of light. 
When the eye catching color, the eyes of the captured information is sent to the brain, 
the brain then processes it so that people can receive information such as the sensation of color.

The theory is then processed again by Hemholtz, 
which is then combined with the theory of Young and Young-HEMOLTZ theory, 
which is a blend of theory with the theory of Young Hemoltz. 
In this theory he added that from a combination of primary colors appear as
 complementary colors warn ever proven by Sir Isaac Newton.