When 2 light rays will intersect, what will happen? Should we take the particle nature or the wave nature of light?
The phenomenon of interference is a characteristic phenomenon of waves. In fact, in 1801, Young's double slit experiment brought out the undulating properties of light. About a century later, in 1905 with the explanation of the photoelectric effect by Einstein was shown that when interacting with matter, light behaves as if it were formed by particles (photons). Thus arises the wave-particle duality of light.
Answer and Explanation:
However, when two light beams interact with each other, only their wave properties will manifest. To interact with each two light beams that intersect at a point in space, must meet the conditions of spatial and temporal coherence. That is, the distance between the light sources has to be constant over time (spatial coherence) and both beams of light must have the same wavelength (temporal coherence). If these conditions are not met, the light rays will be intercepted and will continue without any interaction. In other words, they will behave like solitons.
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from CLEP Natural Sciences: Study Guide & Test PrepChapter 8 / Lesson 16