Q1. The minimum difference "d" between the two arms of a Michelson interferometer that seeks to measure two closely spaced wavelengths using a source for which the coherence length is Lc is given by -
- (1) d = Lc
- (2) d = (Lc)/(2)
- (3) d = 2 Lc
- (4) d = (Lc)/(4)