Snell’s window is a circular cone of light, about 97 degrees wide, that underwater viewers see as the entire above-water world compressed into one view, caused by light bending (refraction) at the water’s surface, where light entering from outside the cone reflects back into the water, creating a darker, mirror-like border. Named after Willebrord Snell, it acts like a natural fisheye lens, revealing the sky and horizon, but compressing the full 180° panorama into a smaller, bright circle. #wacis
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