Fresnel zone plate

Fresnel Rings: The radii of the rings increase with the square root, the line thickness of the first ring is 1/3 r, then decreasing with √ in order to make the area of each ring equal.

Move the white graphic via your cursor position, please. You may zoom in and out if necessary. Check with another browser in case the rendering does still not appeal to you.

selberbewegen unbewegt unbewegt1 unbewegt2 unbewegt3