Problem

In a double slit experiment, the intensity of light at the center of the central bright fringe is measured to be

6.2 \mu\text{W/m}^2

. What is the intensity half way between the center of this fringe and the first dark band, assuming that the small-angle approximation is valid? (a)

6.2 \mu\text{W/m}^2

(b)

3.1 \mu\text{W/m}^2

(c)

4.7 \mu\text{W/m}^2

(d)

1.6 \mu\text{W/m}^2