Q.

Which of the following is not a metallic impurity found in glass in extrinsic absorption?

A. fe2+
B. fe3+
C. cu
D. si
Answer» D. si
Explanation: in the optical fibers, prepared by melting techniques, extrinsic absorption can be observed. it is caused from transition metal element impurities. in all these options, si is a constituent of glass and it cannot be considered as an impurity to glass itself.
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