Hello I'm having trouble with this physics question: You are examining the loss in intensity as light passes through a fibre optic cable. The input intensity is measured as 55.1 W/m2 and the output intensity as 28.7 W/m2. Calculate the attenuation of the signal in decibels (dB)

Question

So far I calculated
𝛽 𝑑𝐵 = 10log10 * 𝐼1/𝐼2
𝛽 𝑑𝐵 = 10log10 * 55.1/28.7 and got 19.1 is it correct?

Answer 1

db = 10*Log(Io/Iin.) = 10*Log(28.7/55.1)