The aquadag coating on the inside of PPI tube is used – McqOptions

MCQOPTIONS

1.	The aquadag coating on the inside of PPI tube is used
A.	To focus the beam of primary electrons
B.	To shield the electron beam from unidirectional magnetic
C.	As a second anode and to prevent the build-up of secondary field
D.	All of these
Answer» D. All of these

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