▁vol cano es ▁Category : Dec ade ▁Vol cano es ▁Category : Loc ations ▁in ▁Greek ▁myth ology ▁Category : Loc ations ▁associated ▁with ▁Arthur ian ▁legend ▁Category : Mount ains ▁of ▁Sic ily ▁Category : P le ist oc ene ▁vol cano es ▁Category : Str at ov ol cano es ▁of ▁Italy ▁Category : Sub du ction ▁vol cano es ▁Category : Three - th ous and ers ▁Category : VE I - 6 ▁vol cano es ▁Category : Vol cano es ▁of ▁the ▁Mediter rane an ▁Sea ▁Category : W ine ▁regions ▁of ▁Italy ▁Category : World ▁Heritage ▁S ites ▁in ▁Italy ▁Category : Art icles ▁containing ▁video ▁cli ps ▁Category : High est ▁points ▁of ▁Italian ▁regions ▁Category : Qu ad ri points ▁and ▁higher <0x0A> </s> ▁In ▁opt ics , ▁polar ized ▁light ▁can ▁be ▁described ▁using ▁the ▁Jones ▁calculus , ▁discovered ▁by ▁R . ▁C . ▁Jones ▁in ▁ 1 9 4 1 . ▁Pol ar ized ▁light ▁is ▁represented ▁by ▁a ▁Jones ▁vector , ▁and ▁linear ▁optical ▁elements ▁are ▁represented ▁by ▁Jones ▁matrices . ▁When ▁light ▁cross es ▁an ▁optical ▁element ▁the ▁resulting ▁polar ization ▁of ▁the ▁emer ging ▁light ▁is ▁found ▁by ▁taking ▁the ▁product ▁of ▁the ▁Jones ▁matrix ▁of ▁the ▁optical ▁element ▁and ▁the ▁Jones ▁vector ▁of ▁the ▁incident ▁light . ▁Note ▁that ▁Jones ▁calculus ▁is ▁only ▁applicable ▁to ▁light ▁that ▁is ▁already ▁fully ▁polar ized . ▁Light ▁which ▁is ▁randomly ▁polar ized , ▁partially ▁polar ized , ▁or ▁in co her ent ▁must