A sample of coloured glass 5.0 mm thick transmits 10% of the incident intensity at a…
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 sample of coloured glass 5.0 mm thick transmits 10% of the incident intensity at a vacuum wavelength of 500 nm. Reflection losses at the two surfaces are negligible, and the glass obeys Beer's law, I=I0e−αz, throughout its thickness.
((a)) Find the absorption coefficient α.
((b)) Find the extinction coefficient κ at this wavelength.
((c)) Express the attenuation as a figure in decibels per millimetre.