A magnetic-field technique for stabilizing a He-Ne laser to 2 parts in 10^10 has been patented. At 632.8 nm, what would be the coherence length of a laser with such frquency stability.
Coherence time =1/delta frequency
coherence length = c/delta frquency
The Attempt at a Solution
dont know what 10^10 stands for and how to solve this
help would be much appreciated.