As per the question,
Wavelength of the laser beam "(\\lambda)=11.5\\times 10^{-7}m"
Speed of light "(c)=3\\times 10^8 m\/sec"
"l_{coh}=1.768m"
"t_{coh}=\\dfrac{l_{coh}}{c}=\\dfrac{1.768}{3\\times 10^{8}}sec=5.9\\times 10^{-9}=5.9ns"
"\\Delta \\lambda=\\dfrac{\\lambda^2}{l}=\\dfrac{(11.5\\times 10^{-7})^2}{1.768}=74.8\\times 10^{-14}m=7.48\\times 10^{-15}m"
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