A good camera lens contains optical components in which two pieces of glass are glued directly together to form a single transparent object. These two-element optical components are important because they?????
2007-04-05 10:04:45 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics
The purpose is to correct for various kinds of errors that would be apparent if a single glass element were used. - A single element lens will focus different colors in slightly different places, causing color fringing (Chromatic Aberration) - Different kinds of glass have different indexes of refraction, which means that they bend light in different amounts. By cementing a positive and a negative lens with different indexes of refraction together, it is possible to correct for Chromatic aberration as well as other errors.
2007-04-08 21:26:46 · answer #1 · answered by Franklin 5 · 0⤊ 0⤋
because they provide indexes of refraction that are more constant with a wider range of wavelengths. This prevents "prisming" effects. These lenses are also called achromatic lenses.
Also... they can provide a wider field of view outside the normal range of spherical abberation that a single lens has.
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Sometimes there are as many as 5 sub-lenses glued together to make a really good lens.
2007-04-05 10:12:44 · answer #2 · answered by tlbs101 7 · 2⤊ 0⤋