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 (click/touch and move), please. If you do not change the scaling you'll meet Pac-Man and his bro in a very rare view from the front!

 950 px (1000 for congruence)

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