A zone plate is to be produced having a focal length of 2 m for a He-Ne laser of wavelength 632.8 nm. An ink drawing of 20 zones is made with alternate zones shaded in, and a reduced photographic transparency is made of the drawing.
a. If the radius of the first zone is 11.25 cm in the drawing, what reduction factor is required?
b. What is the radius of the last zone in the drawing?
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