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From Longman Dictionary of Contemporary English
Related topics: Optics
ldoce_241_dopticalop‧ti‧cal /ˈɒptɪkəl $ ˈɑːp-/ ●○○ adjective  HPOrelating to machines or processes which are concerned with light, images, or the way we see things microscopes and other optical instrumentsoptically /-kli/ adverb
Examples from the Corpus
opticalThis, thought Robert, was something of an optical achievement on her part.Consider a photon which is polarised parallel to the optical axis of P, .Optical bar-code scanners have revolutionized the postal system.optical distortions caused by poor quality lensesThey sell optical equipment such as cameras and telescopes.It also explains why it is virtually certain that Britain's main trunk lines will rely on optical fibre.But lasers have snags: even with optical fibres, lasers can not reach every part of the body.For this reason the phase control signals to these upper base drives are often transmitted via a stage of optical isolation.However, the dimensions of the smallest circuit-parts will soon have shrunk beyond the limit that optical microscopes can resolve.One projected use is for optical recognition experiments.Polished surfaces give the best optical resolution, and the double polished thin sections described in Chapter 4 are ideal.optical instrumentsThe first questions Wien asked were related to the resolving power of optical instruments.There is, however, one classical restriction which we must take into account, namely the resolving power of optical instruments.Even optical instruments, such as perspective machines, the cameraobscura and the camera lucida, were used sparingly.
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