Question

What is meant by half - period zone?

Answer 1

hi mate

here is your answer

Half period zone

1)Half period ratio is ratio of elliptical function i.e

τ =W2/W1

of two half periods W1/2 and W2/2

2)Here the optical wavefront is considered to be divided into number of concentric zones so that illumination from every zone is a half a period out of phase with that of its surrounding.

hope it helps

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