optical density
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～ (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation
optical disk
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～ a disk coated with plastic that can store digital data as tiny pits etched in the surface; is read with a laser that scans the surface
optical bench
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～ apparatus for observation and measurement of optical phenomena
optical fusion
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～ the combining of images from the two eyes to form a single visual percept
optical device
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～ a device for producing or controlling light
optical disc
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～ a disk coated with plastic that can store digital data as tiny pits etched in the surface; is read with a laser that scans the surface
optical condenser
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～ lens used to concentrate light on an object
optical aberration
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～ an optical phenomenon resulting from the failure of a lens or mirror to produce a good image
optical illusion
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～ an optical phenomenon that results in a false or deceptive visual impression
optical instrument
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～ an instrument designed to aid vision
optical lens
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～ a lens that focuses the image in a camera
optical maser
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～ an acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light
optical fibre
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～ a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images
optical crown glass
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～ optical glass of low dispersion and low refractive index
optician
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～ a worker who makes glasses for remedying defects of vision
optics
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～ the branch of physics that studies the physical properties of light
optics
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～ optical properties; "the optics of a telescope"
optimisation
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～ the act of rendering optimal; "the simultaneous optimization of growth and profitability"; "in an optimization problem we seek values of the variables that lead to an optimal value of the function that is to be optimized"; "to promote the optimization and diversification of agricultural products"
optimism
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～ the optimistic feeling that all is going to turn out well