If the two slits in a two-slit apparatus kept the same width,but the distance between the two slits is increased,the number of interference fringes within the diffraction maximum will:
A) decrease
B) increase
C) may do any of the above.
D) remain the same

Question

Quizplus · Accepted Answer

The number of interference fringes within the diffraction maximum will increase if the distance between the two slits is increased. This is because the angular separation between adjacent fringes depends on the distance between the slits, and if that distance increases, the angular separation between the fringes will decrease, which means that more fringes will fit within the diffraction maximum.

If the Two Slits in a Two-Slit Apparatus Kept the Same