When do we see the rainbow?
The rainbow is seen usually right after the rain or while it is raining in the opposite direction from the sun. When the sun is high, the rainbow is low. When the sun is low in the morning or in the evening,the rainbow is bigger. What makes the rainbow like this?What makes the Rainbow?
As above, rainbow are lined from top red, orange, yellow, green, blue, indigo, violet. How to see the colors of the rainbow is different from person to person, but recall the wavelength described in the nature of color, this sequence has always made wavelength and long order. Why, those long wavelength comes up? It is due to the difference in the refractive index of light of different wavelengths.
As shown in the figure above, the light will refract and enter into a different substance from the air. (refer to refraction of light) The light of the sun because it contains all the colors of all the different wavelength, I am side by side from a refractive index as above is small. In other words, we can say that there is a low long as those refractive index of the wavelength.
Therefore, the light of the sun is refracted as above, the greater the angle relative to the ground than light long red light wavelength of long purple wavelength when the reflection, and will be higher.
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2015 身の回りの光と色の現象