One of the two slits in YDSE is painted over, so that it transmits only light waves having intensity half of the intensity of the light waves through the other slit. As a result of this
(1) fringe pattern disappears
(2) bright fringes become brighter and dark ones become darker
(3) dark and bright fringes get fainter
(4) dark fringes get brighter and bright fringes get darker