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Explain the concept of missing orders in case of double and n slit diffraction.

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- Thread starter prashant07
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- #1

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Explain the concept of missing orders in case of double and n slit diffraction.

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On a screen, intensity from interference has all its maxims at the same level (like a cosine), while intensity for diffraction goes like a sinc (sin(x)/x), so that it gradually tends to 0. The sinc has several zeros (when sin(x)=0 except from x=0), and if one of these zeros overlaps a maximum of interference, we see nothing.

So, there is missing order.

Interference depends on the distance between the slits, while diffraction depends on the width of the slits.

For more info, you can read http://en.wikipedia.org/wiki/Double_slit

- #3

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On a screen, intensity from interference has all its maxims at the same level (like a cosine), while intensity for diffraction goes like a sinc (sin(x)/x), so that it gradually tends to 0. The sinc has several zeros (when sin(x)=0 except from x=0), and if one of these zeros overlaps a maximum of interference, we see nothing.

So, there is missing order.

Interference depends on the distance between the slits, while diffraction depends on the width of the slits.

For more info, you can read http://en.wikipedia.org/wiki/Double_slit

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