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A replica (on a smaller scale) of the burning lens owned by Joseph Priestley, in his laboratory
A replica (on a smaller scale) of the burning lens owned by Joseph Priestley, in his laboratory
1658 illustration depicting the sun's rays being focused to start a fire
1658 illustration depicting the sun's rays being focused to start a fire
Close-up view of a flat Fresnel lens. This thin, lightweight, non-fragile and low-cost lens can be used as burning-glass in emergency situations.
Close-up view of a flat Fresnel lens. This thin, lightweight, non-fragile and low-cost lens can be used as burning-glass in emergency situations.
A makeshift burning glass, using the eyepiece of a telescope, being used to burn a leaf.
A makeshift burning glass, using the eyepiece of a telescope, being used to burn a leaf.
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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.