optical component that performs one or more of the following functions from its input to output: increasing the light intensity, filtering the spectrum, modifying light intensity distribution, or changing light direction
Note 1 to entry: Typically, it is a (refractive) lens or a (reflective) mirror. A primary optic receives un-concentrated sunlight directly from the sun. A secondary optic receives concentrated or modified sunlight from a primary optic and directs it to a cell or a tertiary optic. |