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A dive light is routinely used during night dives and cave dives, when there is little or no natural light, but also has a useful function during the day, as water absorbs the longer (red) wavelengths first then the yellow and green with increasing depth. By using artificial light, it is possible to view an object in full color at greater depths.
A Nikonos V amphibious camera Underwater housing for SLR with dome port, arms and lights. Some cameras are made for use underwater, including modern waterproof digital cameras. The first amphibious camera was the Calypso, reintroduced as the Nikonos in 1963. The Nikonos range was designed specifically for use underwater.
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 water, and is governed by Snell's Law. [4]
The ROV was equipped with a high definition (HD) color video camera, a digital still camera, a 12-chambered suction sampler, and static canister samplers. [5] The Global Explorer ROV was the star of the expedition. In strong currents, it collected live specimens as well as photographs and video of unusual and unfamiliar specimens. [6]
[b] Thus, in the Hessdalen lights plasma, the nitrogen ions will decompose (N + 2 + e − → N + N*) more rapidly than oxygen ions. Only ionic species are transported by ion acoustic waves. Therefore, oxygen ions will dominate in the ejected green light balls in Hessdalen lights, presenting a negative band of O + 2 with electronic transition b ...
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