Here's the question you clicked on:
AngelicDragon
Monochromatic light with a wavelength of 6.4 E -7 meter passes through two narrow slits, producing an interference pattern on a screen 4.0 meters away. The first order bright band lines is 2.0 E -2 meters away from the central bright maxima. What is the distance between the slits? 1.3 E -4 m 8.0 E -6 m 3.2 E -9 m 7.8 E3 m
okay so technically it's Physics but they're not helping much right now