A plane monochromatic light wave with intensity I0 falls normally on an opaque screen with a round

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A plane monochromatic light wave with intensity I0 falls normally on an opaque screen with a round aperture. What is the intensity of light I behind the screen at the point for which the aperture
(a) Is equal to the first Fresnel zone; to the internal half of the first zone;
(b) Was made equal to the first Fresnel zone and then half of it was closed (along the diameter)?
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Fundamentals of Physics

ISBN: 978-0471758013

8th Extended edition

Authors: Jearl Walker, Halliday Resnick

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