54.8 MB (17.0 MB compressed)
5360 x 3574 pixels
45.5 x 30.2 cm ⏐ 17.9 x 11.9 in (300dpi)
RICHARD GERMAIN / SCIENCE PHOTO LIBRARY RICHARD GERMAIN / SCIENCE PHOTO LIBRARY
Thick spherical surface lenses have focal lengths that get shorter the further away refracted light is from the main axis. In this image, the inverted real image of the grid tunnel is distorted because of this variable focal length.
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