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.
The human eye is most sensitive to light with wavelengths between 400 nm (blue) and. 700 nm (red). Any âlightâ with wavelengths longer than 700 nm is called infrared and is. not normally visible (except sometimes as a dull deep red). Devices used for OW systems. usually operate in the ânearâ infrared region between 700 nm and 1000 nm.