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Discover LudwigThe phrase "a optical" is not correct in written English.
The correct form is "an optical" because "optical" begins with a vowel sound.
Example: "I purchased an optical device for my photography project."
Alternatives: "a visual" or "an eyesight-related".
Exact(60)
The salesman collected twelve ballots and loaded them into a optical scanner.
In 1910, New York was the first state to require any testing — but only for professional chauffeurs.] (a) Optical Mark Recognition (O.M.R).
(a) Optical flow.
(a) Optical image of the IME chip.
(a) Optical image of graphene based device.
(a) Optical transition in pristine graphene.
(a) Optical and (b) interference micrograph.
a Optical image of the graphene.
(a) Optical transmittance of graphene film.
a Optical fibre based radiation probe for in-vivo brachytherapy.
(a) Optical interband transition excited by incident light.
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