Light Radiation, Opposite to UV
Puzzle 4 of Hinduism Hard Pack
Question is: Light Radiation, Opposite to UV
and the answer is: INFRARED
Word Meaning:
INFRARED — (uncountable) The electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation, having a wavelength between 700 nm and 1 mm.
Definitions from Wiktionary.