No, infrared lights are not visible to the human eye in the dark. Infrared (IR) light is part of the electromagnetic spectrum with longer wavelengths than visible light. The range of wavelengths for infrared light is generally considered to be from about 700 nanometers (near-infrared) to several millimeters.
The human eye is sensitive to visible light, which consists of wavelengths ranging from approximately 400 to 700 nanometers. We perceive visible light as different colors, such as red, orange, yellow, green, blue, indigo, and violet. However, our eyes are not sensitive to infrared light, so we cannot see it directly.
Although infrared light is not visible to our eyes, it can be detected and used in various applications using specialized devices such as infrared cameras, night vision goggles, or infrared sensors. These devices can convert infrared radiation into a visible image or an electronic signal that can be interpreted by humans or other instruments. This allows us to "see" in the dark by detecting the heat or infrared radiation emitted by objects.