As you may have noticed, above you will find words for "The assumption that each point on a wavefront may be regarded as a source of secondary waves and that the position of the wavefront at a later time is determined by the envelope of these secondary waves; proposed in order to explain the fact that light travels in a straight line and casts sharp shadows.". Hover the mouse over the word you'd like to know more about to view its definition. Click to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.