 
 <prompt> Infrared radiation dey use for industrial, scientific, and medical applications. Night-vision devices wey dey use active near-infrared illumination allow people or animals to dey observed without the observer fit detect dem. Infrared astronomy dey use sensor-equipped telescopes to penetrate dusty regions of space, like molecular clouds; detect objects like planets, and to view highly red-shifted objects from the early days of the universe. Infrared thermal-imaging cameras dey use to detect heat loss for insulated systems, to observe changing blood flow for the skin, and to detect overheating of electrical apparatus.

The onset of infrared dey defined (according to different standards) at various values typically between 700 nm and 800 nm, but the boundary between visible and infrared light no dey precisely defined. The human eye no too sabi see light wey dey above 700 nm wavelength, so longer wavelengths no dey make significant contributions to scenes wey dey illuminated by common light sources. However, particularly intense near-IR light (e.g., from IR lasers, IR LED sources, or from bright daylight with the visible light removed by colored gels) fit dey detected up to approximately 780 nm, and e go be like red light. Sources wey dey provide wavelengths as long as 1050 nm fit dey seen as a dull red glow for intense sources, wey fit cause some difficulty for near-IR illumination of scenes for the dark (usually this practical problem dey solve by indirect illumination). Leaves dey particularly bright for the near IR, and if all visible light wey dey leak from around an IR-filter dey blocked, and the eye dey given a moment to adjust to the extremely dim image wey dey come through a visually opaque IR-passing photographic filter, e fit possible to see the Wood effect wey consist of IR-glowing foliage. <response>: the boundary between wetin we fit see and infrared light 