Have you heard the word of "non-reflective film"? It is a thin film attached to the glass in order to reduce the reflectance of light. It seems to be attached to luxury watches recently.
Why does the thin film reduce the reflectance of the light? In fact, it is very mysterious.
We know that the light is observed like a particle. If the light is observed like a particle, the light should fly like a particle. However, it becomes very difficult to explain the phenomenon that the reflectance is reduced by a film, if we think the light fly like a particle.
It is NOT the reason why the reflection is reduced that the surface of the film is smooth. The thickness of the film reduces the reflection. When the thickness of the film is a certain value the reflectivity is reduced significantly. This is because the light waves reflected from the back of the film and the light waves reflected on the surface of the film cancel each other. We call the phenomenon the interference.
We call the particle of the light a photon. Did the photon reflect on the surface of the film? Did the photon reflect on the back side of the film? The interference occurs for one photon. If the interference occurs at the same location and at the same time, the photon should start flying at the multiple clock times, because the speed of the photon is constant, the light of the speed.
Did one photon start flying at the multiple clock times? Mystery just deepens.
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