U1 3

Reflection probability – Reflection and transmission

Slide 1 von 4

Reflection and transmission

How does the single photon behave at the window?

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We see in the window both the face of the janitor and a weaker reflection of Alice. That means that light is partly reflected by the pane of glass, and partly transmitted through it. As light consists of many individual photons, we may ask ourselves how the individual photon on the window pane behaves.
Based on the following experiment on the beam splitter, we will explain that it can’t be predicted whether an individual photon is reflected or transmitted.

If we were able to perceive individual photons, we could then recognise the strongly fluctuating random pattern of transmitted (white square, □) and reflected (black square, ■) photons. Only through the overwhelming number of photons, quantum randomness averages out, becoming invisible to the naked eye.

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