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BS 4274-1:1968 (British Standards Institution) "Specification for test charts for determining distance visual acuity" was replaced by BS 4274-1:2003 "Test charts for clinical determination of distance visual acuity — Specification". It states that "the luminance of the presentation shall be uniform and not less than 120 cd/m 2. Any variation ...
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For 6/6 = 1.0 acuity, the size of a letter on the Snellen chart or Landolt C chart is a visual angle of 5 arc minutes (1 arc min = 1/60 of a degree), which is a 43 point font at 20 feet. [10] By the design of a typical optotype (like a Snellen E or a Landolt C), the critical gap that needs to be resolved is 1/5 this value, i.e., 1 arc min.
Brenda Lee also holds the record span between first and most recent No. 1 on the Hot 100 over the longest period of time: 63 years, five months, two weeks, and five days dating to her first week at No. 1 on the chart dated July 18, 1960, with "I'm Sorry" to her most recent No. 1, "Rockin' Around the Christmas Tree", which was most recently at ...
Printable version; In other projects ... Score distribution chart for sample of 905 children tested on 1916 Stanford–Binet Test ... 1.1 130–139 3.1 120–129 8.2 ...
96-button Stradella bass layout on an accordion. C is in the middle of the root note row. The Stradella Bass System (sometimes called [1] standard bass) is a buttonboard layout equipped on the bass side of many accordions, which uses columns of buttons arranged in a circle of fifths; this places the principal major chords of a key (I, IV and V) in three adjacent columns.
A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem , there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes .
Unbinilium, also known as eka-radium or element 120, is a hypothetical chemical element; it has symbol Ubn and atomic number 120. Unbinilium and Ubn are the temporary systematic IUPAC name and symbol , which are used until the element is discovered, confirmed, and a permanent name is decided upon.