25. The interferometer is used in FT-IR (1) to act like a grating in a monochromator, (2) to
scan wavelengths from low to high, (3) to facilitate FT because the IR frequencies are too
high to be acquired by average-cost electronics, (4) to resolve IR frequencies into a series
of sine and cosine functions, (5) to produce an identical time-domain spectrum of much
lower frequencies. Your answer:
(A) 1,2
(B)1, 2,4
(C)3,4
(D)3, 4,5
(E)5
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