For a Ruby laser, the coherence time t = 10-10 s. The degree of Monoch

1.	For a Ruby laser, the coherence time t = 10^-10 s. The degree of Monochromaticity is __________
A.	0.13 X 10<sup>-4</sup>
B.	0.24 X 10<sup>-4</sup>
C.	0.35 X 10<sup>-4</sup>
D.	0.47 X 10<sup>-4</sup>
Answer» B. 0.24 X 10<sup>-4</sup>

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