1.

In a periscope, how are the reflecting mirrors arranged?

A.  Perpendicular to each other
B.                         Parallel to each other
C.                         At an angle of \[{{90}^{\text{o}}}\]
D.                         At an angle of \[{{60}^{\text{o}}}\]
Answer» C.                         At an angle of \[{{90}^{\text{o}}}\]


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