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index and low dispersion and was formerly used in producing high-quality lenses, but due to its radioactivity has been replaced by lanthanum oxide in modern eyeglasses.[citation needed] Iron can be incorporated into glass to absorb infrared energy, for example in heat absorbing filters for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. COUNT 5
QSN1 What element is used in glass to keep it from becoming too hot? ANS1 Iron QSN2 How does barium affect glass? ANS2 increases the refractive index QSN3 What property of thorium oxide has caused it to no longer be used in eyeglasses? ANS3 radioactivity QSN4 What is another name for lead glass? ANS4 flint glass QSN5 What is the benefit of thorium oxide in addition to its refractive index? ANS5 low dispersion