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

The correct answer is D. Si.

Metallic impurities are elements that are not part of the main composition of glass, but are present in small amounts. They can be introduced into the glass during the manufacturing process, or they can come from the raw materials used to make the glass.

The most common metallic impurities in glass are iron, copper, and manganese. These elements can cause the glass to absorb light in certain wavelengths, which can result in undesirable color changes.

Silica (SiO2) is the main component of glass, and it is not a metallic impurity. It is a non-metallic oxide that is found in sand. Silica is what gives glass

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