Context: Most common glass contains other ingredients to change its properties. Lead glass or flint glass is more 'brilliant' because the increased refractive index causes noticeably more specular reflection and increased optical dispersion. Adding barium also increases the refractive index. Thorium oxide gives glass a high refractive index and low dispersion and was formerly used in producing high-quality lenses, but due to its radioactivity has been replaced by lanthanum oxide in modern eyeglasses.[citation needed] Iron can be incorporated into glass to absorb infrared energy, for example in heat absorbing filters for movie projectors, while cerium(IV) oxide can be used for glass that absorbs UV wavelengths.

Question: What element is used in glass to keep it from becoming too hot?
Answer: Iron

Question: How does barium affect glass?
Answer: increases the refractive index

Question: What property of thorium oxide has caused it to no longer be used in eyeglasses?
Answer: radioactivity

Question: What is another name for lead glass?
Answer: flint glass

Question: What is the benefit of thorium oxide in addition to its refractive index?
Answer: low dispersion

Question: What element is used in glass to help it from becoming more reflective?
Answer: Unanswerable

Question: How does barium affect movie filters?
Answer: Unanswerable

Question: What property of thorium oxide has caused it to no longer be used in projectors?
Answer: Unanswerable

Question: What is another name for cerium oxide?
Answer: Unanswerable

Question: What is the benefit of heat absorbing filters in addition to its refractive index?
Answer: Unanswerable