Which of the following crystals are polished to act as the cut-off reflector?
A. Quartz
B. Beryllium
C. Silicon
D. Lithium
Answer:C
Which of the following crystals are polished to act as the cut-off reflector?
A. Quartz B. Beryllium C. Silicon D. Lithium
Explanation: Quartz crystals are polished to act as the cut-off reflector. It is mounted on the first reflector stage.