optical wedge
noun
: a graded sheet or block (as of glass or film on which is coated a layer of neutral or colored substance varying progressively in transmittance with distance along the sheet) for reducing the intensity of light or radiation gradually or in steps
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“Optical wedge.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/optical%20wedge. Accessed 29 Nov. 2024.
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