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_______ are often used for splitting the beam.(a) Multilayer coated lenses(b) Silvered films(c) Silicate glasses(d) Half-silvered mirrorsI got this question by my school principal while I was bunking the class.This key question is from Methods of Monitoring Foetal Heart Rate in portion Foetal Monitoring Instruments of Biomedical Instrumentation

Answer»

The correct choice is (d) Half-silvered mirrors

Explanation: The two beams must retain the spectral properties of the incident BEAM. Half-silvered mirrors are often used for splitting the beam. However, they absorb some of the LIGHT in the thin metallic coating. Beam splitting can also be ACHIEVED by using a prismatic MIRROR or stack of thin horizontal glass plates, silvered on their edges and ALTERNATIVELY oriented to the incident beam.



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