The transmitting crystal emits 40¬¨¬®‚Äö√†√ª divergent – McqOptions

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1.	The transmitting crystal emits 40¬¨¬®‚Äö√†√ª divergent beam so that the beam covers an area of approximately _____ cm diameter.$
A.	10
B.	20
C.	30
D.	40
Answer» B. 20

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