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Reversibility of Light Disproves the Two-Prism Method.

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Title: Reversibility of Light Disproves the Two-Prism Method.
Authors: Ng, Chiu-king1 (AUTHOR) ngchiuking@hotmail.com
Source: Physics Teacher. Nov2025, Vol. 63 Issue 8, p655-657. 3p.
Subjects: Optics, Physical optics, Optical properties, Visible spectra
Abstract: The article focuses on the theoretical proof of the unworkability of the two-prism method for recombining dispersed spectrum colors back into white light. It argues that the principle of reversibility of light reveals contradictions in the two-prism setup, where the emergent rays cannot converge to form a white ray. The author discusses an alternative four-prism arrangement that successfully disperses and recombines light, adhering to the principles of optics. Additionally, the article addresses the phenomenon of an "apparently white beam" produced by the two-prism setup, clarifying that it results from overlapping colors rather than true recombination. [Extracted from the article]
Copyright of Physics Teacher is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: Reversibility of Light Disproves the Two-Prism Method.
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  Data: The article focuses on the theoretical proof of the unworkability of the two-prism method for recombining dispersed spectrum colors back into white light. It argues that the principle of reversibility of light reveals contradictions in the two-prism setup, where the emergent rays cannot converge to form a white ray. The author discusses an alternative four-prism arrangement that successfully disperses and recombines light, adhering to the principles of optics. Additionally, the article addresses the phenomenon of an "apparently white beam" produced by the two-prism setup, clarifying that it results from overlapping colors rather than true recombination. [Extracted from the article]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Physics Teacher is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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    Identifiers:
      – Type: doi
        Value: 10.1119/5.0205590
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      – Code: eng
        Text: English
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      – SubjectFull: Physical optics
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      – SubjectFull: Optical properties
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              Text: Nov2025
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