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     1100. Mars Numbers (20)People on Mars count their numbers with base 13: Zero on Earth is called “tret” on Mars.The numbers 1 to 12 on Earch is called “jan, feb, mar, apr, may, jun, jly, aug, sep, ...

     The physical meaning and essence of Fresnel numbers are discussed, and two definitions of these numbers for offaxis optical systems are proposed. The universal Fresnel number is found to be N = (a2/λ...

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