Written Laser Hair Removal Practice Exam 2024 - Free Laser Hair Removal Practice Questions and Study Guide.

Infrared light is primarily associated with heat and thermal imaging because it has longer wavelengths than visible light and is not visible to the human eye. It is commonly used in thermal imaging cameras to detect heat signatures and in heating applications due to its ability to penetrate certain materials. Option A is incorrect because while infrared light can be used for visibility in the dark, it is not its primary function. Option B is incorrect because although infrared can be used for data transmission, it is not its primary association. Option D is also incorrect because while sunlight does contain some infrared radiation which is used in photosynthesis, it is not the primary association for infrared light.