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Some of the first phosphors to be developed were inorganic zinc sulphide compounds. (German submarine commanders during ...
319   2018-11-15

The method of observation

5 meters away from the observed object, place the electric torch between mouth and nose, then observe the light source.
314   2018-11-15

Glossary and FAQ

Refractive Index:The refractive coefficient of glass bead to light. They are divided into series of 1.5Nd, 1.9Nd,2.2Nd.&...
397   2018-11-15

Glossary and FAQ

Refractive Index:The refractive coefficient of glass bead to light. They are divided into series of 1.5Nd, 1.9Nd,2.2Nd.&...
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