Question

What are half period strips? ​

Answer 1

Answer:

The half period zone is provided by an optical device known as zone plate. It is simply a plane parallel gloss plate having concentric circles of radii accurately proportional to the square roots of the consecutive natural numbers 1,2,3 ... etc. The area is given by πγ

2

. Hence the

areas are π,2π,3π,4π,---

The phase difference is thus π between each successive half period zones of strips.

Explanation:

hope it helps

make it brainlist

follow me

thank you