2. 2
Prolog
First of all, thanks to Allah SWT because of the help of Allah, writer
finished writing the paper entitled"infrared” right in the calculated time.
The purpose in writing this paper is to fulfill the assignment that given by
Mrs. Vera as a teacher. In arranging this paper, the writer trully get lots challenges
and obstructions but with help of many indiviuals, those obstructions could
passed. Writer also realized there are still many mistakes in process of writing this
paper. Because of that, the writer says thank you to all individuals who helps in
the process of writing this paper. hopefully allah replies all helps and bless you
all.the writer realized tha this paper still imperfect in arrangment and the content.
Then the writer hope the criticism from the readers can help the writer in
perfecting the next paper. Last but not the least Hopefully, this paper can helps the
readers to gain more knowledge about samantics major.
Bogor, 4th April 2017
Author
3. 3
Table of Contents
Prolog........................................................................................................................i
Table of content ......................................................................................................ii
PART I.................................................................................................................1
1.1. Introduction...............................................................................................1
1.2. Purpose.......................................................................................................1
1.3. The Problem ..............................................................................................1
PART II ...............................................................................................................2
Definition ........................................................................................................2
The Frequency & Wave Length Range .......................................................2
The Inventor ...................................................................................................3
Origin...............................................................................................................4
Wave Mechanism ...........................................................................................4
Application In Daily Life................................................................................4
PART II ...............................................................................................................7
Conclusion.......................................................................................................7
Footnote ...........................................................................................................8
4. 4
PART I
1.1. Introdction
Visible light is very common in daily life, but sometimes we do not
realize the Visible Light exist. It is visible to human eyes, but people can
can see this light.
1.2. Purpose
1. To make us realize about Visible Light exsist.
2. Learn about Visible Light.
1.3. The Problem
What is Visible Light?
How long the Visible Light frequency?
How long the Visible Light wave?
Who is the inventor of Visible Light?
What are the application of Visible Light in daily life?
5. 5
PART II
2.1. Definition
Visible light is the light that can be seen by human eyes. Visible Light
is a transverse wave.
2.2. The Frequency & Wave Length Range
Human can see wave between λ = 390-750 nm and f = 400-790 THz (1
THz = 1012
Hz).
The Visible Light has:
Wave Length (λ) = 380 - 750 nm
Frequency (f) = 400 – 789 THz
Color Frequency (f) Wave Length (λ)
Violet 668 – 789 THz 380 – 450 nm
Blue 631 – 668 THz 450 – 475 nm
Cyan 606 – 630 THz 476 – 495 nm
Green 526 – 606 THz 495 – 570 nm
Yellow 508 – 526 THz 570 – 590 nm
Orange 484 – 508 THz 590 – 620 nm
Red 400 – 484 THz 620 – 750 nm
2.3. The Inventor
1) Roger Bacon
6. 6
The discovery of the “Visible Spectrum”. Obtained when he saw a
glass of water.
2) Sir Isaac Newton
In 1672 Sir isaac newton discovered that light that is passed on a
Prism will be devided into a wide variety of colours. It’s known as
disperse light
Newton devide the spectrum into seven colors: red, orange, yellow,
green, blue, indigo, and violet
Newton’s Spectrum:
7. 7
2.4. Origin
Heated objects (temperature around 5000 𝑂
𝐶 such as the sun and
stars), excited atoms, and fireworks, light emmiting diodes (LED).
2.5. Wave Mechanism
Cones in our eyes receivers for these tiny visible light waves. The
sun is a natural source for visible light waves and our eyes see the
reflection of this sunlight off the object around us.
The color of object that we see is the color of light reflected. All the
colors are absorbed.
2.6 Applications In Daily Life
Visible light can be used in daily life, like:
Scanner
8. 8
A mirror with a certain angle at the right corner of the scanner
reflects the document to the lens in the mirror. The lens focuses the document
in a one single lime to CCD ( Charge Coupled Device ), a device that detects
the small changes of the voltage.When the light lights some of the line
detector from the CCD, each of them gives the voltages that are translated to
white, black, and gray.
Copy machine
Light reflector will perform a scanning function to capture the image
of the paper. Then the toner will react automatically so that the ink spills into
the drum, where the ink is shed is in accordance with the scan results. The
inked drum then rotates and automatically prints the scan results on the
surface of the paper that is already available on the copy machine.
Warning reflector or Radar
9. 9
Radar (which in English stands for Radio Detection and Ranging,
which means radio detection and jetting) is an electromagnetic wave system
useful for detecting, measuring distances and making maps of objects such as
airplanes, motor vehicles and weather information ( rain).
Rearview
Rearview using a light sensor (photocell) in the mirror (facing the
driver) to detect the glare from the backlight of our rear car, and on the rear of
the rearview mirror (facing the windshield) to detect ambient lighting overall
(for day / night detection ).
The way it works by distinguishing the light inputs from both
sensors, at night (incoming light from the sensor facing the windscreen is low
/ low), and if there is excessive light entering via the sensor in the mirror
(highlighted by the high beam rear driver) Then the mirror will automatically
darken the mirror glass (so the color of green / dark blue) in accordance with
the intensity of light received so that the driver does not glare, the brighter the
light that panned, the mirror will be darker. This glass technology is also
11. 11
PART III
3.1. Conclusion
Visible Light is the part of the Electro Magnetic spectrum that
people encounter most in everyday life. It is Visible to human eyes. The
wave length of visible light is around 400-780 nm. The frequency of
visible light is around 400-789 THz. There are seven spectrum colors : red,
orange, yellow, green, blue, indigo, and purple.Red has the longest wave
length (λ) but the smallest frequency, and purple has the opposite. Visible
Light was found by Roger Bacon and Sir Isaac Newton. Visible Light are
use for scanner, copy machine, warning reflector, and rearview.
12. 12
3.2. Footnote
Foster, B. 2011. Terpadu Fisika SMA/MA Jilid 2A untuk Kelas XI
Semester I. Jakarta: Erlangga.
Kanginan, M. 2007. Fisika Untuk kelas XI Semester II (Jilid 2B).
Jakarta: Erlangga.
Kanginan, M. 2007. Fisika Untuk SMA kelas X KTSP. Jakarta:
Erlangga.
Kanginan, M. 2005. Seribu Pena Fisika Untuk SMA kelas XII.
Jakarta: Erlangga.
Kanginan, M. 2011. Seribu Pena Fisika Untuk SMA/MA kelas XII.
Jakarta: Erlangga.
Purwoko, dkk. 2010. Fisika 1 SMA kelas X. Yudhistira
Tipler, P.A. 1998. Fisika Untuk Sains dan Teknik. Edisi krtiga
Jilid 1. Jakarta: Erlangga.
Tipler, P.A. 1998. Fisika Untuk Sains dan Teknik. Edisi krtiga
Jilid 2. Jakarta: Erlangga.
Gupta, S.K. 2001. Engineering Physics.Penerbit Krishna
Prakashan Media (P) Ltd., Meerut.
