The Phenomenon Of Rainbow

In physics, colors are identified from the common wavelength. Red, for example, has a wavelength around 625 - 740 nm1, and blue around 435 - 500 nm. Set of colors that is expressed in the long wave-wave (described with the usual?) Is called the color spectrum. Spectrum light based on wavelength. Colors is a component of white light which is called visible light (visible light) or waves appear. Other components are not that visible light (invisible light), such as infrared (on the right side of the color red) and ultraviolet (orange on the left).

White rays that we see a normal (also called visible light or visible light) consisting of all components in the color spectrum in the top - of course there are other components that are not visible, called the invisible light. The simplest tool is often used to decipher the color white is a glass prism

Well, in this nature not only can decipher the prism light. Drops of water - water from rain, for example - is one example of which is available in natural white light can decipher. When a file on a single white light drops of water, water droplets behave like this prism. He diffract white created earlier so that colors of rainbow. One water drops behave like a prism when receiving the white light. Light is partially emanated to the observer, some forwarded.

The interesting question is why we see colors in the rainbow as the blocks of the width? This is because we only see one color for a drop of water!

Sunlight described by droplets of water only to our eyes on the red wavelength. Meanwhile, the water droplets to provide wavelength purple. Droplets of water-drops in them to give each one wavelength in our eyes. So at the end of the rainbow with the observer to see full color.

Interesting things about the rainbow:
Rainbow usually occurs when light rain or after heavy rain stops. After the heavy rain stopped, the air filled with steam by water-steam. In addition, the rainbow can be created in the oil pool. Sometimes on certain conditions, the one white light covered by rainbow. Rainbow can occur when and where it involves the origin of the three at the same time the nature of light, the reflection (reflection), refraksi (refraction), and diffraction.

Iris images from Earth observation in
We can only see a maximum of half-circle rainbow. To see a full circle rainbow, we must stand on a higher.

Illustrated in Figure above shows that the circular rainbow. This is true that the rainbow-shaped loop, such as the parabola is not some suspicion. On the ground, we only see a maximum of half-circle rainbow. If we stand at the top of the rain, for example in the aircraft, then we can see a rainbow circle intact. This is all caused by the optical geometry in the decomposition process color optical geometry With this we can also explain the straight line through the eyes of our Sun and also the point through the center circle rainbow.

Because the iris being involved with the distance observer drops of water, the rainbow always follow the movement of moving observers. This makes our distance with the rainbow constant (the same), in other words we could never approach rainbow.