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The first International Day of Light celebration was organized by UNESCO on May 16, 2018, [6] the anniversary of the date in 1960 when engineer and physicist Theodore Maiman successfully obtained oscillation and output from the first laser. [7] The International Day of Light followed the International Year of Light in 2015. The Day was proposed ...
The International Year of Light and Light-based Technologies 2015 or International Year of Light 2015 (IYL 2015) was a United Nations observance that aimed to raise awareness of the achievements of light science and its applications, and its importance to humankind. IYL 2015 opening ceremonies was held on 19–20 January 2015 in Paris.
World Portuguese Language Day; 16 May - International Day of Light; International Day of Living Together in Peace; 20 May - World Metrology Day since 2023; 21 May - World Day for Cultural Diversity for Dialogue and Development since 2002; 22 May - International Day for Biological Diversity; 24 May - International day of Markhor since 2024
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The World Light Art Award, presented by the Centre for International Light Art Unna and the RWE Foundation, is given to up-and-coming artists who will contribute "to the development of light art in an innovative and creative way" [30] and has been in existence since 2015.
The Centre for International Light Art (CILA, German: Zentrum für Internationale Lichtkunst) is an art museum in Unna, Germany. It is the world's only museum which is exclusively dedicated to the collection and presentation of light art .
The usual result is a negative shadow image that shows variations in tone that depends upon the transparency of the objects used. Areas of the paper that have received no light appear white; those exposed for a shorter time or through transparent or semi-transparent objects appear grey, [1] while fully-exposed areas are black in the final print.
For example, for visible light, the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 200 000 km/s (124 000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 90 km/s (56 mi/s) slower than c.