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2. Non-reversing mirror - Wikipedia

   en.wikipedia.org/wiki/Non-reversing_mirror

   A non-reversing mirror can be made by connecting two regular mirrors at their edges at a 90° angle. If the joint is positioned so that it is vertical, an observer looking into the angle sees a non-reversed image. Such an image is visible while looking toward the corner where the two mirrors meet. With this type of non-reversing mirror, that ...

3. Ambigram - Wikipedia

   en.wikipedia.org/wiki/Ambigram

   When the reflecting surface is horizontal (like a mirroring lake for example), the calligraphic design is a horizontal axis mirror ambigram. The book Ambigrams Revealed features several creations of this type, like the word "Failure" mirroring in the water of a pond to give "Success", or "Love" changing into "Lust".

4. Sextant - Wikipedia

   en.wikipedia.org/wiki/Sextant

   Sextant. A sextant is a doubly reflecting navigation instrument that measures the angular distance between two visible objects. The primary use of a sextant is to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation. The estimation of this angle, the altitude, is known as sighting or shooting ...

5. Brewster's angle - Wikipedia

   en.wikipedia.org/wiki/Brewster's_angle

   Solving for θB gives. For a glass medium (n2 ≈ 1.5) in air (n1 ≈ 1), Brewster's angle for visible light is approximately 56°, while for an air-water interface (n2 ≈ 1.33), it is approximately 53°. Since the refractive index for a given medium changes depending on the wavelength of light, Brewster's angle will also vary with wavelength.

6. Polarization (waves) - Wikipedia

   en.wikipedia.org/wiki/Polarization_(waves)

   This permits a degree of freedom, namely rotation about the propagation direction. When considering light that is propagating parallel to the surface of the Earth, the terms "horizontal" and "vertical" polarization are often used, with the former being associated with the first component of the Jones vector, or zero azimuth angle.

7. Circular polarization - Wikipedia

   en.wikipedia.org/wiki/Circular_polarization

   In electrodynamics, circular polarization of an electromagnetic wave is a polarization state in which, at each point, the electromagnetic field of the wave has a constant magnitude and is rotating at a constant rate in a plane perpendicular to the direction of the wave. In electrodynamics, the strength and direction of an electric field is ...