In a Young's double-slit interference apparatus,by what factor is the distance between adjacent light and dark fringes changed when the separation between slits is doubled?
A)1/4
B)1/2
C)1
D)2

Question

Quizplus · Accepted Answer

The distance between adjacent light and dark fringes is given by λD/d, where λ is the wavelength of light, D is the distance between the slits and the screen, and d is the separation between the slits. If d is doubled, the distance between adjacent fringes becomes λD/2d. Therefore, the factor by which this distance changes is 2, which corresponds to option B.

In a Young's Double-Slit Interference Apparatus,by What Factor Is the Distance