It is a diffracting device used to experimentally demonstrate the diffraction effect.

1.         It is formed on a glass plate by drawing a number of concentric circles on it whose radii are in the ratio of √1:√2:√3........i.e. r∝√n

For some specific distance from this plate the circles coincides with the HPZ's of the Fresnel's theory. (Alternate zones are made opaque).

2.         Positive zone plate: When odd zones are kept transparent to the light and even zones are made opaque, then it is called positive zone plate.

4.         Zone plate behaves like a convex lens. For a plane wave front the image of source is formed at distance d i.e. d is equal to the principle focal length or first focal length f₁ = d =r²/λ

5.         Multiple focii of zone plate are given by  where p = 1, 2, 3..... represents the order of focii

6.         If the radius of n^th circle on zone plate is r_n then in terms of r_n. Principal focal length . Other focal length 

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