Optical Demonstration of Bragg's Law

Details Optical Demonstration of Bragg's Law Optical Demonstration of Bragg's Law

Mar 1961

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961natur.189..741b&link_type=abstract

Nature, Volume 189, Issue 4766, pp. 741 (1961).

Physics

1

Scientific paper

A SIMPLE and rather striking demonstration of Bragg's Law can be given by making use of Lippmann's method for producing colour photographs1. In this method a photographic plate with an extremely fine-grained emulsion is placed with its sensitive layer on a mercury surface. It is then exposed from above, through the glass plate, to monochromatic light, for example from a sodium arc lamp. Due to reflexion at the mercury surface, standing light waves are produced in the sensitive layer, which, after development, give rise to parallel equidistant layers of photolytic silver, with a spacing equal to half the wave-length of sodium light.

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