Direct focussing is obtained by deflecting the ion beam along a _________ trajectory through the magnetic field.(a) 120^o(b) 150^o(c) 190^o(d) 180^oI have been asked this question in an online interview.My doubt is from Magnetic Deflection Mass Spectrometer in section Mass Spectrometer of Analytical Instrumentation

Direct focussing is obtained by deflecting the ion beam along a ______

1.	Direct focussing is obtained by deflecting the ion beam along a _________ trajectory through the magnetic field.(a) 120^o(b) 150^o(c) 190^o(d) 180^oI have been asked this question in an online interview.My doubt is from Magnetic Deflection Mass Spectrometer in section Mass Spectrometer of Analytical Instrumentation
Answer» Correct CHOICE is (d) 180^o Explanation: DIRECT focussing is OBTAINED by DEFLECTING the ion beam along a 180^o trajectory through a magnetic field. The gap between the poles must be large enough to CONTAIN the ion source.

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