Published Jun 5th, 2021, 6/5/21 12:40 pm
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- A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky.
- It takes the form of a multicoloured circular arc.
- Rainbows caused by sunlight always appear in the section of sky directly opposite the Sun.
- Rainbows can be full circles.
- However, the observer normally sees only an arc formed by illuminated droplets above the ground, and centered on a line from the sun to the observer's eye.
- 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 when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
- In a double rainbow, a second arc is seen outside the primary arc, and has the order of its colours reversed, with red on the inner side of the arc.
- This is caused by the light being reflected twice on the inside of the droplet before leaving it.
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