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Originally Posted by andy
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I've always been interested in those Zenith flat CRTs. I broke one open a few years ago and they are ruler flat on the inside too. They look concave because of the optical properties of the glass. .
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Yes, they were flat inside. I did some calculations on the refraction, and it looked like the concave effect from that would be much less than the apparent concavity. Also, if there is even a little pincushion distortion, it adds to the appearance of a concave image.