* The author is part of the community of readers of La Vanguardia
In The Photos of the Readers of La Vanguardia we can contemplate the rainbow in Berga, capital of Berguedà, looking as if it had not wanted to miss the Patum.
Although the rainbow is a continuous gradient of spectral colors, it is considered that these can be defined in seven fundamental colors: red, orange, yellow, green, cyan, blue and violet, which are equivalent to those mentioned by the scientist Isaac Newton in 1704. .
A rainbow or rainbow is an optical and meteorological phenomenon that consists of the appearance in the sky of an arc (sometimes two or more) of multicolored light.
It is caused by the decomposition of sunlight in the visible spectrum, which is produced by refraction, when the sun's rays pass through small drops of water contained in the earth's atmosphere.
It is an arc made up of concentric colored arcs, without a solution of continuity between them, with red towards the outside and violet towards the interior.
Less common is the double rainbow, which includes a second, more subdued arc with inverted colors, that is, red inwards and violet outwards.
