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Use of i = sqrt(-1) is better than 'j'. i is used in Mathematics instead of j
In matrix for fourier transform the minus sign was wrong in the upper value -1. It's 1.
user cems2 says: I beleive the formula used for the spherical lens is wrong. specifically the x in the exponent numerator I think should be a constant, probably unity. as it stands the formula is not symmetric in x and y. —Preceding unsigned comment added by 192.12.184.2 (talk) 22:11, 21 April 2009 (UTC)[reply]
Correct. The x should be the k defined in the previous section. I have corrected this - jhealy 14:05 (GMT), May 20, 2009
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