Thicker in the center than on the edges; they cause parallel light rays emanating from an object to converge onto the same point.

Thicker in the center than on the edges; they cause parallel light rays emanating from an object to converge onto the same point.

Album / Universal Images Group

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4000 x 2250 px | 25.7 MB

33.9 x 19.1 cm | 13.3 x 7.5 in (300 dpi)