In a Two-Slit Experiment, There Are 11 Bright Fringes Within

Multiple Choice

In a two-slit experiment, there are 11 bright fringes within the central diffraction maximum (on each side, the first diffraction minimum coincides with where the next interference bright fringe would be) . What is the ratio of the slit width to the slit separation?

A) 5
B) 1/6
C) 1/5
D) 6