Internal half of the fresnel zone

[harrydj]

Homework Statement

Plane monochromatic light wave with intensity I 0 is incident normally on an opaque screen with a circular hole. What is the light intensity I of the screen at the point for which the hole:
a) is the first Fresnel zone, the inner half of the first zone,
b) made ​​equal to the first Fresnel zone, and then shut it down half (diameter)?

Homework Equations

Here What is the inner half of the first zone? Is there any outer half for the first zone.

The Attempt at a Solution

 

[sankalpmittal]

Homework Statement

Plane monochromatic light wave with intensity I 0 is incident normally on an opaque screen with a circular hole. What is the light intensity I of the screen at the point for which the hole:
a) is the first Fresnel zone, the inner half of the first zone,
b) made ​​equal to the first Fresnel zone, and then shut it down half (diameter)?

Homework Equations

Here What is the inner half of the first zone? Is there any outer half for the first zone.

The Attempt at a Solution

Hint: http://en.wikipedia.org/wiki/Fresnel_zone

What do you notice from here ?