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The energy must be reflected and returned through a single 30° prism, so that it passes through the prism in both directions is called __________(a) Cornu mounting(b) Mono mounting(c) Littrow mounting(d) Trio mountingI have been asked this question in an online quiz.My question is based upon Methods of Monitoring Foetal Heart Rate in chapter Foetal Monitoring Instruments of Biomedical Instrumentation

Answer»

Right option is (C) LITTROW mounting

For explanation I would SAY: Quartz SHOWS the property of double refraction. Therefore, two pieces of quartz, one right-handed and one left handed are taken and cemented back-to-back in the construction of 60° prism (Cornu mounting), or the energy must be reflected and returned through a SINGLE 30° prism, so that it passes through the prism in both directions (Littrow mounting).



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