Physics Assessment #26

The beam splitter in figure 1 is set at what angle to the incident beam?
A) 15
B) 30
C) 45
D) 60

The answer is "C". I read the explanation but I was still confused in how they got the answer.Can anyone explain?

I know that the incident beam reflects as the same angle as the returning beam but I did not know why some parts of the incident beam were initially reflected to the viewing space, since should reach the...

Physics Assessment #26