optics fourier transform definition question

Thread Starter

yef smith

Joined Aug 2, 2020
285
Hello the basic fourier transform in optics is developed as shown bellow where F is the fourer transform operator and Q is the exponent expression.
But later when we use the tranform on actual source we get an expression with fx fy variable defined as shown bellow.
i know that K=2*pi*f as shown in the last expression bellow
how they got the shown bellow f_x to x relations in the optical furier transform?
Thanks.

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