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Guru Nanak Dev Ji (15 April 1469 - 22 September 1539), the founder of Sikhism, was the first person to describe the one light as having two forms - electromagnetic waves. Below is the quote from Sikhism's holy scripture (Guru Granth Sahib):

"O Nanak, the One Light has two forms; through the Shabad, union is attained".

(Sri Guru Granth Sahib Ji, pg. 30).

Heinrich Rudolf Hertz (February 22, 1857 - January 1, 1894) was a German physicist who clarified and expanded the electromagnetic theory of light that had been put forth by Maxwell. He was the first to satisfactorily demonstrate the existence of electromagnetic waves by building an apparatus to produce and detect VHF or UHF radio waves.

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