Diffraction Pattern Observed w/ Converging Light

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Diffraction patterns can still be observed with slightly converging light due to the principles outlined in Maxwell's equations. As a convergent beam propagates, it begins to diffract in space, leading to observable patterns. Over time, the beam will start to diverge, contributing to the diffraction effect. This phenomenon highlights the inherent nature of light behavior in relation to diffraction gratings. Understanding these principles is crucial for analyzing light interactions with optical elements.
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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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