Question

If one of the slits in Young’s double slit experiment is covered with a black opaque paper, then 

(a) the fringe width decreases 

(b) the bright fringes become fainter 

(c) there will be uniform illumination all over the screen 

(d) diffraction pattern will be observed

Answer 1

Answer is (d) diffraction pattern will be observed

If one of the slits in Young’s double slit experiment is covered with a black opaque paper, then we will obtain a single slit diffraction pattern on the screen.