Level 0 · Phenomena · Unit 3 of 3

Three rules

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Both experiments follow from three rules. Here they are in words, with only the numbers you need.

Prediction 1 of 2

Predict first, then run it.

Example

Interferometer, both paths open → D0Interferometer, both paths open → D1Interferometer, lower path blocked → D1Three polarizers → screen

0.5#1

-0.5#2

Amplitude of each way

Total amplitude

Probability (the square)

Two paths lead to D1, with amplitudes +1/2 and −1/2. What is the probability of D1?1/2: each path gives 1/4, and 1/4 + 1/4 = 1/2.01/4

Clears this unit's progress and drawing record on this device.