Question
a.
both sides of the target plate have the coating of tin oxide
b.
both sides of the target plate have the coating of antimony tri-sulphide
c.
the side of target plate facing the light has a coating of tin oxide and the side facing electron gun has a coating of antimony trisulphide
d.
the side of target plate facing the light has a coating of antimony trisulphide while the side facing the electron gun has a coating of tin oxide
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