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The idea that the observer alters reality in a double-slit experiment has been widely disseminated. There are some problems with this idea. In this video, we will address two points that can generate a lot of confusion. The first concerns the observer. What is this observer? Does it have to be a person, a conscious being? The second point is the alteration of reality. What does it mean to alter reality? The double-slit experiment or (double slit experiment) plays a very important role in quantum physics and classical physics. The role of the observer in the double-slit experiment and its relationship to wave-particle duality is indeed surprising. The Copenhagen interpretation of quantum mechanics helps us understand this relationship. The Copenhagen interpretation allows us to understand the role of the observer in the double-slit experiment. See also: Schrödinger's Cat - • Schrödinger's Cat - A paradox of ... DOUBLE SLIT (double slit - part 1 of 3) - • DOUBLE SLIT - What is the d... WAVE-PARTICLE DUALITY (double slit - part 2 of 3) - • WAVE-PARTICLE DUALITY and the d... The animations about the double-slit experiment shown in this video were made by: Amination: DAFOX Scientific consultancy: J. Bobroff Support: Univ. Paris Sud, SFP, Triangle de la Physique, PALM, Sciences à l'Ecole, ICAM-I2CAM References: HERZOG, Thomas J. et al. Complementarity and the quantum eraser. Physical Review Letters, v. 75, n. 17, p. 3034, 1995. WALBORN, SP et al. Double-slit quantum eraser. Physical Review A, v. 65, n. 3, p. 033818, 2002. Script and presentation: Romeu Rossi Júnior Edition: Nívea Freitas