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  2. Optical disc - Wikipedia

    en.wikipedia.org/wiki/Optical_disc

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  3. Beam splitter - Wikipedia

    en.wikipedia.org/wiki/Beam_splitter

    Phase shift through a beam splitter with a dielectric coating. Beam splitters are sometimes used to recombine beams of light, as in a Mach–Zehnder interferometer.In this case there are two incoming beams, and potentially two outgoing beams.

  4. Relascope - Wikipedia

    en.wikipedia.org/wiki/Relascope

    Relascope usage. The Relascope is used by looking through the hole in the front of the instrument. When users look through this hole they will see several scales that are used for different measurements on the bottom half of their view, and on the top half they will see the tree that they are looking at.