Answer: polarizing

AnswerCrossword Clue
polarizingRestrict the vibrations of (a transverse wave, esp. light) wholly or partially to one direction
polarizingDivide or cause to divide into two sharply contrasting groups or sets of opinions or beliefs
polarizingCause (something) to acquire polarity
polarizingPOLARIZE, to give polarity to, also POLARISE