A Liquid of Refractive Index N = 4/3 Replaces the Air

Multiple Choice

A liquid of refractive index n = 4/3 replaces the air between a fixed wedge formed from two glass plates as shown.As a result, the spacing between adjacent dark bands in the interference pattern:

A) increases by a factor of 4/3
B) increases by a factor of 3
C) remains the same
D) decreases to 3/4 of its original value
E) decreases to 1/3 of its original value