![]() The film-a long strip of translucent images-is positioned in the middle of a movie projector. Historically, all movies were recorded on film. It uses a very bright light source and lenses to project a big, bright image onto a screen. The projector at the back of the movie theater is similar, but it is a more complex optical device. The image was small, dim, and upside down. Have you ever made a pinhole camera? If you have, you were projecting an image onto a flat surface. ![]() In a movie theater, you watch an image projected onto a screen. But how is such a big, clear, and moving image produced? Light rays shine onto the movie screen to produce the image we see as a moving picture. What is the physics behind watching a movie? While a movie character often begins in someone’s imagination, the character’s image on the screen is a real image. Welcome to the world according to Hollywood, a world of make-believe made from moving images and digital sound. In the dark, you can hear an occasional cough or the rustle of candy wrappers and smell the aroma of buttered popcorn. When the lights in the movie theater dim and cell phones are muted, the movie is about to begin.
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