Since every object has some temperature, every object rediates energy. Why then, can't we see objects in the dark?
The objects are not radiating energy in the visual range in sufficient intentity to be detected.
We cannot see objects in the dark because our eyes are not sensitive enough to detect the very low levels of radiation emitted by objects at room temperature.
To understand why this happens, we need to consider the concept of thermal radiation. Objects above absolute zero temperature emit electromagnetic radiation, known as thermal radiation, in the form of infrared light. This radiation is not visible to our eyes, as our eyes are only sensitive to a narrow range of wavelengths, known as the visible spectrum.
In the presence of light, objects can reflect and scatter the visible light, allowing us to see them. However, in the absence of any external light sources, objects are only visible if they emit or reflect enough infrared radiation to be detectable by specialized equipment or if their temperature is significantly different from their surroundings.
In complete darkness, when there is no external light to illuminate the objects and they are at room temperature, the amount of thermal radiation emitted is very low. This means that even though objects are radiating energy, it is not enough to be detected by our eyes. As a result, we perceive the objects as being invisible in the dark.
To see objects in the dark, we can use technology like infrared cameras that can detect and convert the emitted thermal radiation into visible images. These cameras are designed to detect the infrared radiation and present it as visible light, allowing us to observe objects even when there is no visible light present.