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Question
What does the Michelson interferometer do?
Options:
A .  Split a polychromatic beam of radiation into its component wavelengths
B .  Selectively filter certain wavelengths from a beam of I.R. radiation
C .  Modulate the I.R. signal at a lower frequency, so that it can be observed by a detector
D .  none of the above
Answer: Option C
Answer: (c).Modulate the I.R. signal at a lower frequency, so that it can be observed by a detector

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