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Infra-red light. Invisible to human eyes, but relatively easy to generate, focus, and detect.
For people with normal vision, that would have to be light.For people with impaired vision or no vision, I'd say heat.Heat and light are the only electromagnetic radiation thathumans can detect physiologically. You might go way outand say that after light and heat, the next one is radio.
infrared
infrared radiation-apex
Infrared light is used in industrial, scientific, and medical applications. Night-vision devices using infrared illumination allow people or animals to be observed without the observer being detected.
They allow you to see infared rays
Infra-red light. Invisible to human eyes, but relatively easy to generate, focus, and detect.
Vision is not any type of energy. Vision can detect the visible range of the electromagnetic spectrum by the interaction of electromagnetic waves with chemical compounds; this interaction then results in electrical impulses being sent to the brain.
all of them
For people with normal vision, that would have to be light.For people with impaired vision or no vision, I'd say heat.Heat and light are the only electromagnetic radiation thathumans can detect physiologically. You might go way outand say that after light and heat, the next one is radio.
The question is a lot like asking "What is the frequency of hearing ?", or "How fast is speed ?", or "How much does money cost ?". "Night vision" is the sensitivity of the human eye to extremely low light conditions, or the use of optical and electronic devices to render an invisible scene in visible wavelengths. It's not a type of radiation that can be located on the electromagnetic spectrum.
Bats can detect bio-sonar. They use it for echolocation.
The hearing aids which transmit and detect electromagnetic waves as electromagnetic wave can propagate on the moon.
infrared
Infra-red waves are used in night vision apparatus.
infrared radiation-apex
Infrared light is used in industrial, scientific, and medical applications. Night-vision devices using infrared illumination allow people or animals to be observed without the observer being detected.