Multiple choice general knowledge

Which one of the following types of waves are used in a night vision apparatus?

  1. Radio waves

  2. Microwaves

  3. Infra-red waves

  4. None of the above
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C Correct answer
Explanation

Night vision apparatus uses infrared waves (also called thermal radiation) to detect objects in darkness based on their heat signatures. All objects emit infrared radiation, which is invisible to human eyes but can be detected by specialized sensors that convert it into visible images. Radio waves and microwaves have much longer wavelengths and don't provide the spatial resolution needed for imaging. Night vision specifically operates in the infrared spectrum.

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