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2. Underwater vision - Wikipedia

   en.wikipedia.org/wiki/Underwater_vision

   Underwater vision

3. Snell's window - Wikipedia

   en.wikipedia.org/wiki/Snell's_window

   Snell's window. A diver viewed from below who appears inside of Snell's window. Snell's window (also called Snell's circle[1] or optical man-hole[2]) is a phenomenon by which an underwater viewer sees everything above the surface through a cone of light of width of about 96 degrees. [3] This phenomenon is caused by refraction of light entering ...

4. Magnesium torch - Wikipedia

   en.wikipedia.org/wiki/Magnesium_torch

   A magnesium torch is a bright light source made from magnesium, which can burn underwater and in all weather conditions. They are used for emergency illumination for railroad applications. They were also used in the 1950s up to the early 1970s as a light source for scuba diving, and were featured occasionally in television shows.

5. Marine aquarium - Wikipedia

   en.wikipedia.org/wiki/Marine_aquarium

   A marine aquarium is an aquarium that keeps marine plants and animals in a contained environment. Marine aquaria are further subdivided by hobbyists into fish only ( FO ), fish only with live rock ( FOWLR ), and reef aquaria. Fish only tanks often showcase large or aggressive marine fish species and generally rely on mechanical and chemical ...

6. Vision in fish - Wikipedia

   en.wikipedia.org/wiki/Vision_in_fish

   Bioluminescence is the only light available at these depths. This lack of light means the organisms have to rely on senses other than vision. Their eyes are small and may not function at all. [41] [42] At the very bottom of the ocean flatfish can be found. Flatfish are benthic fish with a negative buoyancy so they can rest on the seafloor ...

7. Aquarium lighting - Wikipedia

   en.wikipedia.org/wiki/Aquarium_lighting

   The lighting used for reef aquariums is the highest intensity of all aquarium types. Typical light sources types include LED, fluorescent, metal halide, and sometimes plasma lamps. Simple lighting setups use a single lamp or multiple lamps of a single type. More advanced setups can include several lamp types and can also include lamps of ...