Optical fibers can be used as sensors. Special fibers are used for this, that change how they pass light through when there is a change around the fiber. Sensors like this can be used to detect changes in temperature, pressure, and other things. These sensors are useful because they are small and do not need any electricity at the place where the sensing happens.
A Christmas tree with normal and fiber-optic lights
These fibers are also used to carry light for humans to see. This is sometimes used for decoration, like fiber-optic Christmas trees. Sometimes it is used for lighting, when it is convenient to have the light bulb someplace other than where the light needs to be. This is sometimes used in signs and art for special effects.
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The inside of a clock, viewed through a fiberscope.
A bundle of fibers can be used to make a device called an endoscope or a fiberscope. This is a long thin probe that can be put into a small hole, that will send an image of what is inside through the fiber to a camera. Endoscopes are used by doctors to see inside the human body, and are sometimes used by engineers to see inside tight spaces in machines.
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