例文・使い方で印象づける「focal」の覚え方
スポンサーリンク...The magnifying power of a compound microscopedepends upon the focal length of the object-glass (orglass nearest the object), upon the length of the tube,and the power of the eye-piece... 
Henry J. Slack 「Marvels of Pond-life」
...A pond, a little more than an acre in size, was a focal area foropossums and more were caught there than on any other part ofthe Reservation...
Henry S. Fitch 「Ecology of the Opossum on a Natural Area in Northeastern Kansas」
...The focal attention iscentred on the Infanta, with the figures on either side more orless out of focus, those on the extreme right being quite blurred...
Harold Speed 「The Practice and Science Of Drawing」
...The diameter and focal length of a lens must depend in a great measureon the distance of the object, and also on the superficies of the plateor paper to be covered...
Henry H. Snelling 「The History and Practice of the Art of Photography」
...The inner lens is an achromatic 3 1/4 inches diameter, its focal lengthbeing 30 inches...
Henry H. Snelling 「The History and Practice of the Art of Photography」
...Admitting the light of the sun through a narrowslit in a window-shutter, an inverted image of the slit can be thrown, by alens of suitable focal length, on the wall opposite...
George Forbes 「History of Astronomy」
...As a camera obscura is actually atelescope, magnifying objects in proportion to the focal length of thelens employed, he may be said to have first seen these spots with theaid of an optical instrument...
David Brewster 「The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler」
...The first was made with a Newtonian telescope something less than seven feet focal length, a power of 222, and an aperture of four and a half inches...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...By reflection from this mirror the focal plane and theimages are shifted to F, where they may be examined fromone side through the magnifying glass E...
George C. Comstock 「A Text-Book of Astronomy」
...It is clear that theshorter the focal length of ab, the nearer must ab be placed to theimage, and the smaller will the emergent pencils be, but the greater themagnifying power of the eye-glass...
Richard A. Proctor 「Half-hours with the Telescope」
...If no new adjustment is required for distinct vision, the sphericalaberration is corrected, since the mean focal length and the focallength of the central rays are equal...
Richard A. Proctor 「Half-hours with the Telescope」
...telescope having a focal length of8½ feet:...
Richard A. Proctor 「Half-hours with the Telescope」
...5 feet focal length, and another, of 12 inches diameter and 18 feetfocal length, for Lamont, of Munich...
George Forbes 「History of Astronomy」
...The diameter of this object-glass isthirty-six inches, and its focal length is fifty-six feet two inches...
Robert Stawell Ball 「The Story of the Heavens」
...We may apply eye-glasses of different focal length...
Richard A. Proctor 「Half-hours with the Telescope」
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