In optical pyrometers, absorption
filter is used ________ .
to get monochromatic light
to eliminate stray rays of light
to minimize reflection of rays from the lens
surface
to enable filament operation at
reduced intensity for longer life
to enable filament operation at
reduced intensity for longer life
●Optical
pyrometer is a device which is used to measure the temperature of any object,
the optical pyrometer compares the brightness produced by the radiation of
object whose temperature is to be measured with some reference temperature.
●Absorption
filter is used to enable the filament operation of reduced intensity for longer
life.
Hence,
the correct option is (D).
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