Excerpt from Absolute Specular Reflectometer With an Autocollimator Telescope and Auxiliary Mirrors The Strong method for measuring reflectance is used in.wany laboratories. However, an uncertainty in the angular position of the sample can lead to large errors. A novel use of an autocollimator telescope with two auxiliary mirrors (actam) can reduce this angular uncertainty and lead to more accurate measurement of reflectance. The instrumentation, its adjustment, measurement procedure, results, and uncertainties are discussed. The total uncertainty for the reflectance measurement of a gold mirror was found to be less than over. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.