questionedithistorytranslationsWhat is the unit of measure of the luminous flux in the SI system?Lux242Lumen487Candela280Illuminance68The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source Share and bring new players to the game!correct this questionTschukareach: rather globallightphysicsBlondinrikard Fröbergwikipedia → Lumen (unit)Light quizPhysics quizWho should you expect to show stronger red-eye effect?Blue-eyed people. The iris plays no role in the effect, but the blue-eyed people have relatively low melanin in the fundus as well. Therefore, they show a much stronger red-eye effect, as the light passing fundus is not absorbed by melanin. The role of melanin in red-eye effect is nicely demonstrated in case of heterochromia (one eye blue, one brown): typically, only the blue eye displays the effect.What kind of building is that?Solar power plant. In The PS10 Solar Power Plant, 624 movable mirrors concentrate the sun's rays to the top of a 115 meter (377 ft) high, tower where a steam turbine is located. The plant is located near Seville, Spain.What are the most luminous objects in the universe?Quasars. A quasar is an extremely energetic source of radiation powered by accretion disc around galaxy's central supermassive black hole. Quasars were much more common in the early universe, as all known quasars are extremely distant.Which of these countries has the most Leopard 2 tanks?Greece. Switzerland - unlisted here - has the most, 380. Greece is second with 340 than Turkey with just a few less. What's interesting, Germany has the least of them with around 100 less than Greece.