Direct focussing is obtained by deflecting the ion beam along a _________ trajectory through the magnetic field.
A. 120o
B. 150o
C. 190o
D. 180o
Answer:D
Direct focussing is obtained by deflecting the ion beam along a _________ trajectory through the magnetic field.
A. 120o B. 150o C. 190o D. 180o
Explanation: Direct focussing is obtained by deflecting the ion beam along a 180o trajectory through a magnetic field. The gap between the poles must be large enough to contain the ion source.