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Jim Hutton as detective Ellery Queen, posing with a magnifying glass
Jim Hutton as detective Ellery Queen, posing with a magnifying glass
A plastic Fresnel lens sold as a TV-screen magnifier
A plastic Fresnel lens sold as a TV-screen magnifier
Magnifying glass on an arm lamp
Magnifying glass on an arm lamp
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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.