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  2. Dive light - Wikipedia

    en.wikipedia.org/wiki/Dive_light

    Water attenuates light by absorption, so use of a dive light will improve a diver's underwater vision at depth. [1] As the depth increases, more light is absorbed by the water. Color absorption depends on the purity of the water - pure water is most transparent to blue frequencies, but impurities may reduce this significantly.

  3. Water clarity - Wikipedia

    en.wikipedia.org/wiki/Water_clarity

    Water clarity is a descriptive term for how deeply visible light penetrates through water. In addition to light penetration, the term water clarity is also often used to describe underwater visibility. Water clarity is one way that humans measure water quality, along with oxygen concentration and the presence or absence of pollutants and algal ...

  4. Underwater vision - Wikipedia

    en.wikipedia.org/wiki/Underwater_vision

    Underwater vision is the ability to see objects underwater, and this is significantly affected by several factors. Underwater, objects are less visible because of lower levels of natural illumination caused by rapid attenuation of light with distance passed through the water. They are also blurred by scattering of light between the object and ...

  5. Caustic (optics) - Wikipedia

    en.wikipedia.org/wiki/Caustic_(optics)

    Caustics produced by a glass of water, visible as patches of light Cardioid caustic at the bottom of a teacup Caustics made by the surface of water Caustics in shallow water In optics , a caustic or caustic network [ 1 ] is the envelope of light rays which have been reflected or refracted by a curved surface or object, or the projection of that ...

  6. Sonar - Wikipedia

    en.wikipedia.org/wiki/Sonar

    Its name is because it was designed for patrol divers (combat frogmen or clearance divers) to look for limpet mines in low visibility water. The LUIS (lensing underwater imaging system) is another imaging sonar for use by a diver. There is or was a small flashlight-shaped handheld sonar for divers, that merely displays range.

  7. Flashlight - Wikipedia

    en.wikipedia.org/wiki/Flashlight

    Some flashlights can be used under water or in flammable atmospheres. ... Light use depends on speed, quality of trail, surrounding light 1000 and up High powered

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