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Which of the following is the dielectric?

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Which of the following is the dielectric?

(a) MgF3

(b) ZnF2

(c) ZnS

(d) ZnF3

The question was asked during an interview.

Origin of the question is Methods of Monitoring Foetal Heart Rate in chapter Foetal Monitoring Instruments of Biomedical Instrumentation

1 Answer

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Correct answer is (c) ZnS

For explanation: Interference filters usually consist of two semi-transparent layers of silver, deposited on glass by evaporation in a vacuum and separated by a layer of dielectric (ZnS or MgF2). In this arrangement, the semi-transparent layers are held very close.

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