Question

• Diffraction due to circular
aperture If a light passes through a
small pinhole, and incident on a
screen. What will be observed on the
screen?​

Answer 1

Answer:

When light from a point source passes through a small circular aperture, it does not produce a bright dot as an image, but rather a diffuse circular disc known as Airy's disc surrounded by much fainter concentric circular rings.

Explanation:

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Answer 2

The diffraction pattern through a circular slit is called as Fraunhoffer diffraction. It has a central bright band surrounded by concentric circular bands of reducing intensities.

When light passes through a small circular aperture, it diffracts along all directions with the angular distribution have a path difference of y*sinα where y is the distance of the screen from the slit.

The intensity drops along the angular distribution and thus results in a concentric diffraction pattern with a central bright circular band. The central band is known as Airy disk. The successive bands are of decreasing intensity.

Such a diffraction pattern produced by a circular slit is called as Fraunhoffer Diffraction.