A polished glass sample is measured to attenuate a 632.8 nm (vacuum wavelength) beam…
PHYSICS · Multi-part · Fermi University Physics · Optics & Photonics · Wave propagation and light in media · Wave propagation and light in media
What an Instrument Can See, Ch The optical constants of a medium
Problem
A polished glass sample is measured to attenuate a 632.8 nm (vacuum wavelength) beam by 3.0 dB per kilometre, with the loss taken as uniform absorption (no scattering).
((a)) Convert this figure to an absorption coefficient α in m−1.
((b)) Find the extinction coefficient κ of the complex index n~=n+iκ at this wavelength.