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X MIPA 7
A rainbow is an optical and meteorological phenomenon that is caused by
both reflection and refraction of light in water droplets in the Earth's atmosphere, resulting
in a spectrumof light appearing in the sky. It takes the form of multicoloured arc.Rainbows
caused by sunlight always appear in the section of sky directly opposite the sun.
The rainbow is not located at a specific distance, but comes from an optical illusion
caused by any water droplets viewed from a certain angle relative to the sun ray's.
A rainbow is not an object, and cannot be physically approached.It is impossible
for an observer to see a rainbow from water droplets at any angle other than the customary
one of 42 degrees from the direction opposite the sun. Even if an observer sees another
observer who seems "under" or "at the end of" a rainbow, the second observer will see a
different rainbow further off at the same angle as seen by the first observer.
A rainbow spans a continuous spectrum of colours. Any distinct bands perceived
are an artifact of human colour vision, and no banding of any type is seen in a black-andwhite photo of a rainbow, only a smooth gradation of intensity to a maximum, then fading
towards the other side. For colours seen by the human eye, the most commonly cited and
remembered sequence is Newton's sevenfold : red, orange, yellow, green, blue, indigo and
There are many variations of rainbow, such as: Multiple Rainbows / Secondary
Rainbow, Twinned Rainbows, Tertiary and Quaternary Rainbows, Higher-order Rainbows,
Supernumerary Rainbow, Reflected Rainbow, Full Circle Rainbow, Monochrome Rainbow,
Rainbows under moonlight.
A rainbow is composed of the entire spectrum of colors visible
light, from the longest wavelength red, to the shortest wavelength violet
with the others colors between.
A rainbow usually appears in the sky after rain when sunlight and
rain combine in a specific way. Rainbow is created both by reflection and
refraction (bending) of sunlight in raindrops. When it bends, it will
separated into the colors we usually see in the rainbow: red, orange,
yellow, green, blue, indigo, and violet.
Sunlight is actually made up of different colors we can’t see.
When a beam of sunlight comes down to earth, the light is white. But,
when it hit the raindrop in certain angle, the different colors will appear.
The angle of each colors is different, because the colors slow
down at different speed when they enter the raindrop. The light exist the
raindrop in one color, depending on the angle it came in. Light at the
different angle coming through many raindrops from the rainbow in
various colors we can see now.
Rainbows are caused by rays of sunlight that reflect back
toward the sun after hitting spherical water droplets, such as
those found in a raincloud or in rain itself. The light does not
reflect directly back toward the sun, but rather are offset at
approximately 42 degrees, the "Rainbow Angle". Thus, you will
see the rainbow in a perfectly circular arc, whose radius is 42
degrees and whose center is directly opposite the sun. Since
blue light travels at a slightly different speed within the water
droplet then red light, the angle is just a little bit different for
different colors, leading to the lovely color bands in a rainbow.
Although you don't always see the same length of the
rainbow's arc, all rainbows have the same apparent angular
diameter, no matter how far away the water droplets are. This
is true whether the droplets come from a garden hose or a
What is Fire Rainbow?
The fire rainbow is a beautiful phenomenon , it looks like a colorful cloud.
It happens because the cloud is composed by the water , which has similar size , it
can reflect , refract and also diffraction with lights.
Fire rainbow is different from the rainbow , rainbow is a spectrum of the
light , which has difference colors , while the fire rainbow is a clouds , which has
difference colors.If the rainbow is formed by reflection and refraction process , the
fire rainbow is formed due to the diffraction.In ordinary rainbow , rainbow occurs
because light is deflected when it passes the layers, which has difference density.
While the fire rainbow is due to diffraction ,diffraction is when the light waves are
converted into the shapes such as ring.
Some people called fire rainbow with" Circumhorizontar arc".The
uniqueness of this rainbow is mostly occur without the existence of the rain.The
brightly of this rainbow is occurs during summer or at in certain latitudes.If this
rainbow is formed by droplets , which were in the atmosphere , so the fire rainbow
will be formed by the ice crystals in the atmosphere.Requirement the ice crystals
has to be heksagonal , it was at an altitude cirrus clouds then it is illuminated by
the sun ,which has the angle about 58 degrees or more.If all the conditions are not
full , then the fire rainbow will not happen.This were the reason why the fire
rainbow is called a rare.
: Rintik hujan
: Sinar/ sorotan
: Berada/ terdapat
: Panjang gelombang
: tetesan air
: merrefleksikan / memantulkan
: sekitar / kurang lebih
: lengkungan/ busur
: berbentuk lingkaran
: secara langsung
: menuju/ ke depan
: Disebabkan oleh
: Massa Jenis
: Garis Lintang
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