For an ordinary light source, the coherence time t = 10-10 s. The degree of Monochromaticity for a wavelength of 6000 is ___________

For an ordinary light source, the coherence time t = 10-10 s. The degr

1.	For an ordinary light source, the coherence time t = 10^-10 s. The degree of Monochromaticity for a wavelength of 6000 is ___________
A.	0.1 X 10<sup>-4</sup>
B.	0.2 X 10<sup>-4</sup>
C.	0.3 X 10<sup>-4</sup>
D.	0.4 X 10<sup>-4</sup>
Answer» C. 0.3 X 10<sup>-4</sup>