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diffraction

(Encyclopedia)diffraction, bending of waves around the edge of an obstacle. When light strikes an opaque body, for instance, a shadow forms on the side of the body that is shielded from the light source. Ordinarily...

interference

(Encyclopedia)CE5 Constructive interference: Two crests or two troughs meet and combine (A, B, C). Destructive interference: A crest and a trough meet and cancel each other (D, E, F). interference, in physics, ...

Sabatier, Auguste

(Encyclopedia)Sabatier, Auguste ôgo͞ostˈ säbätyāˈ [key], 1839–1901, French Protestant theologian. He was professor (1867–72) of reformed dogmatics at Strasbourg, and from 1877 until his death he was a me...

photochemistry

(Encyclopedia)photochemistry, study of chemical processes that are accompanied by or catalyzed by the emission or absorption of visible light or ultraviolet radiation. A molecule in its ground (unexcited) state can...

bioluminescence

(Encyclopedia)bioluminescence bīˌōlo͞oˌmĭnĕsˈəns [key], production of light by living organisms. Organisms that are bioluminescent include certain fungi and bacteria that emit light continuously. The dinof...

Zsigmondy, Richard Adolf

(Encyclopedia)Zsigmondy, Richard Adolf, 1865–1929, Austrian-German chemist, Ph.D. Univ. of Munich, 1889. Zsigmondy was a lecturer at the Univ. of Munich (1887–1893) and at the Univ. of Graz (1893–97), then wo...

revue

(Encyclopedia)revue, a stage presentation that originated in the early 19th cent. as a light, satirical commentary on current events. It was rapidly developed, particularly in England and the United States, into an...

Balder

(Encyclopedia)Balder bôlˈdər, bäl– [key], Norse god of light; son of Odin and Frigg. He was the most beautiful and gracious of the gods of Asgard. His mother extracted oaths from all things in nature not to h...

Pereira, I. Rice

(Encyclopedia)Pereira, I. Rice (Irene Rice Pereira) pərāˈrə [key], 1907–71, American painter, b. Chelsea, Mass. In 1935, Pereira helped found the Federal Art Project design laboratory and taught there for sev...

intermezzo

(Encyclopedia)intermezzo ĭntərmĕtˈsō, –mĕdˈzō [key]. 1 Any theatrical entertainment of a light nature performed between the divisions of a longer, more serious work. 2 In the 17th and 18th cent., a short ...