Everyone with eyesight and a job does.
They can be connected to a light bulb or some other 'visible' means to indicate that someone it at the door.
The same as it does for visible light.
Yes. It certainly is. Great work !
Telescopes that work with visible light, as opposed to other radiations such as infrared, ultraviolet, x-rays, etc.
No. X-Rays have a greater frequency than visible light. In order of increasing frequency(or decreasing wavelength). Radio waves, Microwaves, Infra-red radiation, Visible light, Ultraviolet radiation, X-rays, Gamma rays.
Actors obviously
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People work with dogs, horses, oxen, camels llamas, elephants, and many other kinds of animals. It all depends on where in the world they work. In a zoo, people work with all kinds of animals, but in an aquarium, mostly dolphins.
Mirrors. Lasers. Interferometers. Radar (just not visible light).
Color filters transmit visible wavelengths of light. Different colors respond to different wavelengths of light. Some filters work by absorbing light, while others reflect.
farmers
Night vision goggles work by detecting and amplifying ambient light, including infrared light not visible to the human eye. This allows users to see in low-light or no-light conditions. The goggles do not emit waves to locate people, but instead enhance existing light sources in the environment.