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.
For example, the limits of the visible light range is defined by what our eyes can detect. Although other electromagnetic waves â radio waves, infrared light, ultraviolet light, X-rays and gamma rays â represent âcoloursâ that are invisible to us, they are nonetheless forms of light. Electromagnetic Spectrum Activity