Question

In a Young'* double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to

A) D/2

B) D/√2

C) √2D

D) 2D

E) 4D

Answer 1

The correct option is: (D) 2D

Explanation:

From mλ = dx / L, d x2 needs L x2 also.