Fog rainbow
Another rare optical phenomenon is the fog bow. It does not appear as often as it may seem. It requires very specific conditions, the fog is made up of very small water droplets (with a radius of less than 25 micrometres). Because of the diffraction of light, which increases as the droplets get smaller, colours disappear. Therefore, a misty rainbow is white in colour, for which sailors have nicknamed it ‘ghostly’. It usually appears over the sea or marshy areas.
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Halo
A halo is one of the most beautiful wonders of nature, which is a halo around a powerful light source like the Sun or the Moon. It seems as if this heavenly eye is looking down on you from above. This phenomenon occurs most often in high latitudes with puffy clouds, when sunlight is refracted in ice crystals. Halo is called a ‘false sun’.
