A physicist is optimizing a double-slit interference setup. In the initial setup (Setup 1), light of wavelength λ \lambda\,λ is incident on a double-slit of slit separation sss, and the interference pattern is observed on a screen at a distance DDD. The separation between adjacent bright fringes is 4.0 mm.
In the modified setup (Setup 2):
What is the separation between adjacent bright fringes in Setup 2?
1.5 mm1.5\text{ mm}1.5 mm
3.8 mm3.8\text{ mm}3.8 mm
4.8 mm4.8\text{ mm}4.8 mm
6.0 mm6.0\text{ mm}6.0 mm
