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2. Kaleidoscope - Wikipedia

   en.wikipedia.org/wiki/Kaleidoscope

   Kaleidoscope. A toy kaleidoscope. A kaleidoscope ( / kəˈlaɪdəskoʊp /) is an optical instrument with two or more reflecting surfaces (or mirrors) tilted to each other at an angle, so that one or more (parts of) objects on one end of these mirrors are shown as a regular symmetrical pattern when viewed from the other end, due to repeated ...

3. Halo (optical phenomenon) - Wikipedia

   en.wikipedia.org/wiki/Halo_(optical_phenomenon)

   The crystals behave like prisms and mirrors, refracting and reflecting light between their faces, sending shafts of light in particular directions. Atmospheric optical phenomena like halos were part of weather lore, which was an empirical means of weather forecasting before meteorology was developed. They often do indicate that rain will fall ...

4. Chromostereopsis - Wikipedia

   en.wikipedia.org/wiki/Chromostereopsis

   Chromostereopsis is a visual illusion whereby the impression of depth is conveyed in two-dimensional color images, usually of red–blue or red–green colors, but can also be perceived with red–grey or blue–grey images. [1] [2] Such illusions have been reported for over a century and have generally been attributed to some form of chromatic ...

5. Does It Look Like I'm Here? - Wikipedia

   en.wikipedia.org/wiki/Does_It_Look_Like_I'm_Here?

   4.0/5 [9] Uncut. [10] Does It Look Like I'm Here? is a 2010 album from the band Emeralds. It contains a mix of tracks previously released as 7-inch singles and new material. [3] Pitchfork placed it at number 36 on its list of "The Top 50 Albums of 2010", [11] and number 139 on its list of "The 200 Best Albums of the 2010s".

6. Lead glass - Wikipedia

   en.wikipedia.org/wiki/Lead_glass

   Cut glass wine glass made of lead glass. Lead glass, commonly called crystal, is a variety of glass in which lead replaces the calcium content of a typical potash glass. Lead glass contains typically 18–40% (by mass) lead(II) oxide (PbO), while modern lead crystal, historically also known as flint glass due to the original silica source, contains a minimum of 24% PbO.

7. Nicol prism - Wikipedia

   en.wikipedia.org/wiki/Nicol_prism

   Nicol prism. A Nicol prism is a type of polarizer. It is an optical device made from calcite crystal used to convert ordinary light into plane polarized light. It is made in such a way that it eliminates one of the rays by total internal reflection, i.e. the ordinary ray is eliminated and only the extraordinary ray is transmitted through the ...