Definition - Constructivism. Definition of Constructivism. Constructivism is a theory of learning based on the idea that knowledge is constructed by the knower. based on mental activity. Learners are considered to be active organisms seeking meaning. Constructions of meaning may initially bear little relationship to reality (as in the naive theories of.
The visible spectrum is the portion of the electromagnetic spectrum that is visible to (can be detected by) the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light.
Visible and infrared (IR) wavelengths are part of the continuous electromagnetic spectrum. Within the IR part of the spectrum, there is a long-wave infrared (LWIR) spectrum. There, objects emit energy even when visible light is not present.Thermal imaging... 1  Can highlight people, animals, and objects. 2  Be used to track fugitives or vehicles. 3  Works in both daylight and darkness. 4  Can see through haze and smoke.ithin the IR part of the spectrum, there is a long-wave infrared (LWIR) spectrum. There, objects emit energy even when visible light is not present. Thermal imaging... 1  Can highlight people, animals, and objects. 2  Be used to track fugitives or vehicles. 3  Works in both daylight and darkness. 4  Can see through haze and smoke.