Infrared radiation is rather an interesting subject, however you should not be ignorant about it and what it really is, why it’s invisible to human eye. Are you up for the quiz?
Infrared light
Electromagnetic field
Illumination
None of the above
650 nanometers
700 nanometers
859 nanometers
600 nanometers
Nanometer
Cathode ray
Ultra rays
Infrared
Wave
Quantum
Photon
All of the above
George Moore
George Washington
Allan Sugar
William Herschel
Rays
Energy
Light
None of the above
Ultra ray
Ultra violet
Radiation
Infrared
Movement
Weather
Climate
None of the above
Atom
Photon
Oxygen
Molecule
Dipole moment
Infrared
Atom
Sodium
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Here's an interesting quiz for you.