A certain uniform waveguide 2-cm long is transmitting an optical signal, the power of which is measured at the output of the waveguide to be 1 W. If the waveguide is cut so that its length is reduced...

A certain uniform waveguide 2-cm long is transmitting an optical signal, the

power of which is measured at the output of the waveguide to be 1 W. If the

waveguide is cut so that its length is reduced by 10%, the optical power at the

output is found to be 1.2 W. What is the attenuation coefficient (in cm−1) in

the waveguide?