Lanthanoids used in glass blower's goggles are:

Pr and Nd

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Eu and Gd

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Tb and Dy

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Pm and Sm

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Solution

The correct option is A Pr and Nd
Didymium is a mixture of the elements Pr (praseodymium) and Nd (neodymium). It is used in safety glasses for glassblowing and blacksmithing. This is particularly useful when a gas powered forge is used, where goggles made of didymium filters out yellowish light at 589 nm that corresponds to hot sodium. Normal welder's glasses do not offer this protection and an unsuspecting technician might
be prone to the ill effects of such an exposure.

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