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how to compare and contrast the interference pattern with coherently illuminated single slit

how to compare and contrast the interference pattern with coherently illuminated single slit

Grade:12th pass

2 Answers

Saurabh Koranglekar
askIITians Faculty 10336 Points
2 years ago
In the interference pattern, all the bright fringes are of the same intensity. In diffraction pattern, all the fringes are not of the same intensity. The central fringe is the brightest and the intensity keeps decreasing for successive fringes.

In interference, the intensity of the minimum is generally zero or very small, and there is a good contrast between bright and dark fringes. In diffraction, the intensity of minima is never zero and there is poor contrast between bright and dark fringes.

The width of interference fringes may or may not be equal. But the width of diffraction fringes is always unequal.

Regards
Vikas TU
14149 Points
2 years ago
Dear student 
The separation of the interference fringes depends on the slit separation. If now the slit width is increased the width of the diffraction envelope is decreased whilst the separation of the interference fringes stays the same. So less interference fringes will be visible.
Good Luck

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