All Problems

Diffraction of Light

Problem 5.100

A plane monochromatic light wave with intensity I0I_{0} falls normally on an opaque screen with a round a perture. What is the intensity of light II 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)?

Reveal Answer
(a) I2≈4I0,I≈2I0I^{2} \approx 4 I_{0}, I \approx 2 I_{0} (b) I≈I0I \approx I_{0}
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