In a classic Single-Lens Reflex (SLR) camera, what internal component swings out of the way when you shoot?
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In an SLR camera, a small mirror reflects the light coming through the lens up into the viewfinder so you see exactly what the lens sees. When you press the shutter button, this mirror instantly swings upward to let the light hit the film or digital sensor instead. This rapid movement is what creates the iconic, satisfying clicking sound of traditional SLR and DSLR cameras. Photo: Start54, Wikimedia Commons, CC BY 4.0.
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Source: Wikipedia (CC BY-SA)
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