What is Spectrum of Light

After the dispersion of light or any electromagnetic wave, a band of colors is formed, which is known as spectrum.

But with the development of information technology, a much more attractive information carrier has appeared, which is constantly evolving. These are electronic versions of simple books , periodicals, the number of which is growing day by day. Their biggest advantage is their price. If a printed book costs several hundred rubles, and an encyclopedia is generally up to several thousand, then e-books, as a rule, are offered at a price of 50 to 100 rubles. The difference is quite tangible.