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Qualitatively examine the diffraction pattern for light going through a circular opening. Describe the pattern; compare...

Qualitatively examine the diffraction pattern for light going through a circular opening. Describe the pattern; compare with the pattern for a rectangular slit.

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Answer #1

when a light is passed through an opaque board with a circular hole in it, the light is diffracted by the hole. if received on a screen at a large distance, the pattern is a bright disc surrounded by an alternate dark and bright rings of decreasing intensity as shown in the diagram. The bright and dark ring is formed by the superposition of secondary wavelets sent by the hole.

Foa a rectangular aperture, all slits are of finite length and will therefore produce diffraction on both directions. If the length of the slit is much greater than its width, then the spacing of the horizontal diffraction fringes will be much less than the spacing of the vertical fringes.

Rectangular Aperture Pattern -

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