Focus
The Optical Dictionary · 1904 · p. 7
The point to which a pencil of rays converges or from which it diverges.
Bu kavram başka kaynaklarda da geçiyor
A Dictionary of Scientific Terms (1927)
Adair's New Encyclopedia (1923)
Hawkins' Electrical Dictionary (1915)
The American Illustrated Medical Dictionary (1913)
The American Dictionary and Cyclopedia (1910)
The Nurse's Dictionary of Medical Terms and Nursing Treatment (1909)
Webster's Condensed Dictionary- A Condensed Dictionary of the English Language (1909)
Chamber's Twientieth Century Dictionary (1908)
Chandler's Encyclopedia (1898)
Pears Shilling Cyclopedia (1898)
Chamber's Etymological of the English Language (1895)
Webster's Practical Dictionary- A Practical Dictionary of the Englih Language (1884)
A Military Dictionary (1810)
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