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I designed a setup similar to Michelson Interferometer but with one mirror only. So, there is an angle between the 2 rays to the detector:

enter image description here

In order to understand the result on screen, I used (Zemax/OpticStudio) for simulation. The results are surprising. if there is no interference, the total power on screen is 0.96 W.

enter image description here

If there is interference, the total power is 0.49 W.

enter image description here

Note: I assumed the power from source is 1 W.

So, what is the reason behind these 2 different results?

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