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A pair of contact lenses, positioned with the concave side facing upward
A pair of contact lenses, positioned with the concave side facing upward
Typical pair of single vision glasses
Typical pair of single vision glasses
These bifocals are upside down as they rest on the surface. The add segment of the lens for near vision is the D-shaped area.
These bifocals are upside down as they rest on the surface. The add segment of the lens for near vision is the D-shaped area.
Prismatic color distortion shown with a camera set for nearsighted focus, and using -9.5 diopter eyeglasses to correct the camera's myopia.
Prismatic color distortion shown with a camera set for nearsighted focus, and using -9.5 diopter eyeglasses to correct the camera's myopia.
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A burning apparatus consisting of two biconvex lens
A burning apparatus consisting of two biconvex lens
Light being refracted by a spherical glass container full of water. Roger Bacon, 13th century
Light being refracted by a spherical glass container full of water. Roger Bacon, 13th century
Lens for LSST, a planned sky surveying telescope
Lens for LSST, a planned sky surveying telescope
Real image of a lamp is projected onto a screen (inverted). Reflections of the lamp from both surfaces of the biconvex lens are visible.
Real image of a lamp is projected onto a screen (inverted). Reflections of the lamp from both surfaces of the biconvex lens are visible.