▁from ▁o var ian ▁cancer ▁Category : De ath s ▁from ▁cancer ▁in ▁the ▁Philippines ▁Category : Fil ip ino ▁mus icians ▁Category : Fil ip ino ▁female ▁sing ers ▁Category : Fil ip ino ▁educ ators ▁Category : Fil ip ino ▁activ ists ▁Category : Pe ople ▁from ▁Pas ig ▁Category : Mus icians ▁from ▁Metro ▁Man ila ▁Category : Univers ity ▁of ▁the ▁Philippines ▁al umn i ▁Category : Univers ity ▁of ▁the ▁Philippines ▁fac ulty ▁Category : A ten e o ▁de ▁Man ila ▁University ▁fac ulty ▁Category : 2 0 th - century ▁sing ers ▁Category : 2 0 th - century ▁women ▁sing ers <0x0A> </s> ▁A ▁G lan – T aylor ▁pr ism ▁is ▁a ▁type ▁of ▁pr ism ▁which ▁is ▁used ▁as ▁a ▁polar izer ▁or ▁polar izing ▁beam ▁split ter . ▁It ▁is ▁one ▁of ▁the ▁most ▁common ▁types ▁of ▁modern ▁polar izing ▁pr ism . ▁It ▁was ▁first ▁described ▁by ▁Arch ard ▁and ▁Taylor ▁in ▁ 1 9 4 8 . ▁ ▁The ▁pr ism ▁is ▁made ▁of ▁two ▁right - ang led ▁pr isms ▁of ▁cal cite ▁( or ▁sometimes ▁other ▁b ire fr ing ent ▁materials ) ▁separated ▁on ▁their ▁long ▁faces ▁with ▁an ▁air ▁gap . ▁The ▁optical ▁axes ▁of ▁the ▁cal cite ▁cry st als ▁are ▁aligned ▁parallel ▁to ▁the ▁plane ▁of ▁reflection . ▁ ▁Total ▁internal ▁reflection ▁of ▁s - pol ar ized ▁light ▁at ▁the ▁air ▁gap ▁ens ures ▁that ▁only ▁p - pol ar ized ▁light ▁is