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

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

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