radiation filter
  • An element or device, such as a disk or plate of plastic or glass, which selectively blocks or absorbs one or more intervals of frequencies of radiation.
  • An element or device, such as a disk or plate of plastic or glass, which selectively blocks or absorbs one or more intervals of frequencies of electromagnetic radiation, such as light. The optical properties of the element or device determine which frequencies pass, and which are blocked or absorbed. Also called filter (4), or optical filter.

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