* The author is part of the community of readers of La Vanguardia
The Tramuntana blows strongly, leaving in its wake a sea moved with large waves, where at sunrise this rainbow could be seen in the sea in L’Escala, in Alt Empordà, which we can see in Photos of the Readers of La Vanguardia.
A rainbow is an optical and meteorological phenomenon that consists of the appearance in the sky of one arc (or, in this case, two) of multicolored light.
It is caused by the decomposition of sunlight into the visible spectrum, which occurs by refraction, when the sun’s rays pass through small droplets of water contained in the Earth’s atmosphere.
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. .
In this case, it appears to us as a rainbow also similar to the phenomenon of iridescence, which is caused by multiple reflections of light on multiple semi-transparent surfaces, where the subsequent phase changes and interference of the reflections modulate the light by amplification. or attenuation of different wavelengths. Depending on the angle at which the surface is illuminated, it will look different colors.
