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http://en.wikipedia.org/wiki/Mach%E2%80%93Zehnder_interferometer

In the Mach-Zehnder two of the mirrors are half silvered.

The photon has a 50% chance of passing through the half-silvered mirror and 50% chance of being reflected.

1. What happens if we make the mirror 3/4 silvered?

I.e. the photon has 25% chance of passing through and 75% chance of being reflected?

2. What happens if we make the mirror 1/4 silvered?

I.e. the photon has 75% chance of passing through and 25% chance of being reflected?