Hasken infrared mai nisa yana da ikon shiga, refraction, radiation da tunani. Jikin ɗan adam na iya ɗaukar FIR saboda zurfin iya shigarsa. Lokacin da FIR ta shiga ta fata zuwa kyallen jikin fata, yana canzawa daga makamashin haske zuwa makamashin zafi.