Definition of refractor in English:



  • 1A lens or other object which causes refraction.

    • ‘An arc of white light shone through the carefully planned refractors near its crest, making the Citadel look like an archer's bow drawn to the sky.’
    • ‘Your doctor may use a computerized refractor to measure your eyes and estimate the prescription you need to correct a refractive error.’
    • ‘The results demonstrated that trained nurses and lay screeners achieved similar accuracy rates administering the two automated refractors.’
    • ‘Each GSP student builds a complete 60-mm diameter f / 12 refractor and mount.’
    • ‘He contributed to the theory of refraction, and as a result of his theory of the wave form of light he was able to calculate the refraction within the lenses and make refractors with lesser chromatic and spherical aberration.’
    1. 1.1 A refracting telescope.
      • ‘One evening he was observing with a rather crude refractor (a lens telescope), with a focal length of 24 feet.’
      • ‘K. Sakthivel of the Astronomy Club said that the group of observers used a 60 mm refractor to project the image of the sun upon a flat surface where it could be viewed comfortably.’
      • ‘Secretary Martin Armitage said: ‘We will have our observatory telescope aimed at the Sun, as well as our pride and joy - a special solar filter attached to a premium refractor.’’
      • ‘At the same site you can take a virtual tour of the observatory and its telescope, whose refractor is still the largest of its kind in the world.’
      • ‘The nine-centimetre Orion refractors are best-suited for viewing the moon, but there's something to be said for being able to do it from the comfort of your plunge pool.’
      • ‘This he equipped with a small refractor: a lens telescope with an aperture of four inches.’
      • ‘Lowell established an observatory on Mars Hill in Arizona and the telescope he used - a superb Brashear refractor - has been sitting here, unused, for years.’
      • ‘Italian mathematician and astronomer Galileo Galilei used the first optical telescope, a refractor, in 1610.’
      • ‘The Big Bear investigators used a telescope of only modest size - a 6-inch refractor.’
      • ‘Actually it was the biggest refractor (lens telescope); Sir William Herschel, who had died in 1822, had previously constructed larger reflecting telescopes (using curved mirrors) out at Slough.’