Diffraction Pattern Observed w/ Converging Light

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SUMMARY

The discussion centers on the observation of diffraction patterns when slightly converging light interacts with a diffraction grating. It is established that Maxwell's equations predict this phenomenon, indicating that even a convergent beam will start to diffract as it propagates. Over a certain distance, the beam will begin to diverge, leading to observable diffraction effects.

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retupmoc
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Can anyone explain to me why there is still a diffraction pattern observed even if the light is slightly converging when it hits the diffraction grating
 
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Anyone got any ideas, just need a sentance or 2 to explain why
 
There is a short answer: Maxwell's equations predict that it is so.

Slightly longer answer: Even a convergent beam will begin to diffract in space as it propagates. Eventually, after propagating a certain distance the beam will begin to diverge.

Claude.
 

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