1.

What is used as a light source in ear oximeter?(a) Mercury-vapor lamp(b) Sodium-vapor lamp(c) Tungsten-iodine lamp(d) Sulfur lamp

Answer» Right choice is (c) Tungsten-iodine lamp

Easy explanation: The light source is a tungsten-iodine lamp that has a high output in the spectrum of interest. A lens system collimates the light beam and directs it through thin-film interference filters that provide wavelength selection.


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