Karl Strehl
Karl Wilhelm Andreas Strehl (April 30, 1864 — June 14, 1940) was a German physicist, author and mathematician. He is notable for the Strehl ratio, a widely used measurment for the optical quality of an imaging system.
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Wikipedia
Karl Wilhelm Andreas Strehl (April 30, 1864 — June 14, 1940) was a German physicist, author and mathematician. He is notable for the Strehl ratio, a widely used measurment for the optical quality of an imaging system.