How this is happened?, There are 7 colours in the Rainbow, Shape of Rainbow,

3. What s
rainb w
???

4. Rainbow is an optical and meteorological phenomenon that
is caused by both reflection and refraction light in water’s
droplet in the Earth's atmosphere, resulting in
a spectrum of light appearing in the sky. It takes the form of
a multicoloured arc. Rainbows caused by sunlight always
appear in the section of sky directly opposite the sun.
All rainbows are full circles, however, the average observer
only sees approximately the upper half of the arc, the
illuminated droplets above the horizon from the observer's
line of sight.
In a "primary rainbow", the arc shows red on the outer part
and violet on the inner side. This rainbow is caused by light
being refracted (bent) when entering a droplet of water,
then reflected inside on the back of the droplet and refracted
again when leaving it.

5. When we can see a rainbow?

6. Rainbow can be seen after the rain. The perfect time
and place to look for a rainbow needing bright
sunlight in back and rain clouds off in the distance in
the direction of your shadow. If it is later than 4.30 in
the afternoon or earlier than 8.30 in the morning at
these condition there is a very good chance to see a
rainbow in the sky. Other places, rainbows can be
seen in fountains, in the ocean as the waves crash
against the rock which create a mist in the air,
waterfalls, sprinklers and mist from a garden hose.

7. When you see a rainbow ...

8. How this is happened ?

9. 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. Thus, a rainbow is not an object, and cannot be
physically approached. Indeed, 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.

10. 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
violet.

11. Do you know colours of Rainbow??...

13. Red is active, powerful, stimulating,
impulsive and successful. It’s attentiongrabbing, and perfect for highlighting a
company’s achievements during the year.
Orange represents physical excitement,
abundance and enjoyment. It makes text
stand out, and will really bring strings of
divisional reports to life.
Yellow is fun, optimistic, creative and
expressive of the desire for change – the
ideal color for outlining future plans.

14. Green, being the center of the spectrum, is
calm, reassuring, balanced and
unchanging. Use this to emphasize your
environmental record, or to take the sting
out of bad news.
Blue and indigo are trustworthy, efficient
and accurate, and ideal for indicating that
your finances are healthy. Blue is also
dependable, as in ―true blue‖.
Violet and purple are colors of quality, with
charming, mystical and dreamy overtones.
If they can’t give gravitas to the chairman’s
letter, nothing will.

15. Shape of Rainbow

16. As we know, the rainbow just appears half of
circle form, but actually the rainbow is a circle
form. Rainbow can be seen perfectly, if it is
seen by standing in the high place like in the air
plane or standing on top of mountain. It is real
that rainbow is a circle form not like parabola
form. On the ground is not perfect but only half
of circle form.
Interestingly, the location of the rainbow totally
depends on the position of the person who can
see it, and on the position of the sun relative to
that person. If the sun is shining towards the
eyes, rainbow can be seen. The sun needs to
be behind the people, so that can see a
rainbow and the sun at the same time.