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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 \[{{90}^{\text{o}}}\] | |