draw a graph showing the variation of fringe width with distance from screen. what info you get from the slope? what will be the effect on fringe width if distance between slits is reduced?
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Fringe width should be decreased
raulraulsareen4:
i think it will increase
In case of diffraction by a single slit, it is width of the central maximum that gives the necessary information.
The width of the central maximum is distance between two first order minima. This distance is given by
2(Lambda)D/d.
Here, d is width of the slit.
So, if D is decreased the diffraction pattern is narrowed. The fringe width decrease.
The width of the central maximum is distance between two first order minima. This distance is given by
2(Lambda)D/d.
Here, d is width of the slit.
So, if D is decreased the diffraction pattern is narrowed. The fringe width decrease.
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