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2

I guess it's because it's easy to add all sorts of materials that make the surface absorptive for a broad spectrum such as for visible light. Then it'll look black. To write on a black paper you need something that really covers the paper adding material which reflects all visible light, causing a white color. As far as the human eye and its dynamical range ...


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Your understanding of the degradation mechanism is correct. However, you can compensate for this to some degree by training your pupils to contract underwater, thereby reducing the refractive variation of light transmitted to your retina. This famous study by Anna Geslen describes this in detail, and also showed that the remarkable underwater visual acuity ...


11

Yes, your myopia is relevant in the sense that you notice immediately a huge improvement in your long distance vision when wearing goggles underwater. Short-sighted people have difficulty in focusing distant objects (or nearly parallel light rays); the eye is "too long" for the lens and the focus falls in front of the retina. Corrective lenses for myopia ...


52

Is blurred effect due to turbulence? No, it is not. The turbulence has a little effect here. Even if there is no turbulence, one see everything blurred underwater. The reason is explained below. An eye is a natural lens. A clear shot of something you see depends on how well the image is focused on your eye. The most of the refraction in the eye occurs ...


2

Being shortsighted I needed glasses while growing up, but managed to avoid wearing them by cheating the yearly eye-tests at school. (While the tester was in the teacher's lounge drinking coffee I memorized the two bottom lines of the chart he left in the gym.) My best friend wore glasses and complained constantly that other people made fun of him and I ...


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The conditions called cyclotropia usually treated with surgery, experiments with double dove prisms are going well but slow and nothing on market. Most like when it does first come to the optical market it will be as a type of mounted monocular or some combination of the double dove prism model but similar too the stick on Fresnel prism commonly found today. ...


3

For typical laser goggles the color of lens is the color of light that is transmitted through the lens. Thus if the lens is red, it will not protect you from laser beams that are in the red portion of the spectrum. The color you are looking for will be, in some sense, the complementary color; since red-orange-pink are far from blue-violet-ultraviolet, ...


4

There are three pigments in the human eye cone cells and combinations of their light sensitivities are the basis of our color vision. These pigments are red, green, and blue. The violet end of the spectrum excites blue pigment only. Less-extreme 'blue' perception includes some slight green pigment response. The color that results from red and blue ...



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