DOUBLE SLIT EXPERIMENT

INTERFERENCE: WHEN TROUGH AND TROUGH OR CREST AND CREST OF TWO LIGHT WAVES MEET, THAT POINT APPEARS BRIGHT. IF CREST AND TROUGH MEET, THE WAVES CANCEL EACH OTHER AND THE POINT LOOKS DARK. HENCE, IF LIGHT WAVES PASS THROUGH TWO SLITS, ALTERNATE BRIGHT AND DARK BANDS APPEAR.