Multiple choice general knowledge

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

  1. Radio waves

  2. Micro waves

  3. Infra-red waves

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Night vision apparatus works by detecting infrared radiation, which is emitted by all objects based on their thermal energy. Infrared waves have longer wavelengths than visible light, making them invisible to the human eye but detectable by specialized equipment.

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